1CCON(1)               User Contributed Perl Documentation              CCON(1)
2
3
4

NAME

6       ccon - Cluster administration tool
7

VERSION

9       This documentation is for version: 4.16
10

SYNOPSIS

12       ccon [-K <seconds>] [-q] [-c '<filename>'] [-x <cols>] [-C
13       '<filename>'] [--debug [[...] || <INTEGER>]] [-d] [-e
14       '<[user@]<host>[:port]>'] [--fillscreen] [-f '<font>'] [-h] [-L
15       '[tag]'] [-H] [-M '<STRING>'] [-p <port>] [-Q] [-y <rows>] [-s] [-r
16       '<filename>'] [-t '<STRING>'] [-g] [-T '<title>'] [-u] [-?] [-A] [-v]
17
19       Also see the individual man pages for each of these utilities
20
21       crsh - Use 'rsh' as the communication method
22       csftp - Use 'sftp' as the communication method
23       cssh - Use 'ssh' as the communication method
24       ctel - Use 'telnet' as the communication method
25

DESCRIPTION

27       The command opens an administration console and an xterm to all
28       specified hosts.  Any text typed into the administration console is
29       replicated to all windows.  All windows may also be typed into
30       directly.
31
32       This tool is intended for (but not limited to) cluster administration
33       where the same configuration or commands must be run on each node
34       within the cluster.  Performing these commands all at once via this
35       tool ensures all nodes are kept in sync.
36
37       Connections are opened using console which must be correctly installed
38       and configured.
39
40       Extra caution should be taken when editing files as lines may not
41       necessarily be in the same order;  assuming line 5 is the same across
42       all servers and modifying that is dangerous.  It's better to search for
43       the specific line to be changed and double-check all terminals are as
44       expected before changes are committed.
45
46   Further Notes
47       Please also see "KNOWN BUGS".
48
49       •   The dotted line on any sub-menu is a tear-off, i.e. click on it and
50           the sub-menu is turned into its own window.
51
52       •   Unchecking a hostname on the Hosts sub-menu will unplug the host
53           from the cluster control window, so any text typed into the console
54           is not sent to that host.  Re-selecting it will plug it back in.
55
56       •   If your window manager menu bars are obscured by terminal windows
57           see the "screen_reserve_XXXXX" options in the
58           $HOME/.clusterssh/config file (see "FILES").
59
60       •   If the terminals overlap too much see the "terminal_reserve_XXXXX"
61           options in the $HOME/.clusterssh/config file (see "FILES").
62
63       •   When using ClusterSSH on a large number of systems to connect to a
64           single system using an SSH utility (e.g. you issue a command to to
65           copy a file using scp from the remote computers to a single host)
66           and when these connections require authentication (i.e. you are
67           going to authenticate with a password), the sshd daemon at that
68           location may refuse connections after the number "MaxStartups"
69           limit in sshd_config is exceeded.  (If this value is not set, it
70           defaults to 10).  This is expected behavior; sshd uses this
71           mechanism to prevent DoS attacks from unauthenticated sources.
72           Please tune sshd_config and reload the SSH daemon, or consider
73           using the ~/.ssh/authorized_keys mechanism for authentication if
74           you encounter this problem.
75
76       •   If client windows fail to open, try running:
77
78           "ccon -e {single host name}"
79
80           This will test the mechanisms used to open windows to hosts.  This
81           could be due to either the "-xrm" terminal option which enables
82           "AllowSendEvents" (some terminals do not require this option, other
83           terminals have another method for enabling it - see your terminal
84           documentation) or the configuration of "console".
85

OPTIONS

87       Some of these options may also be defined within the configuration
88       file.  Default options are shown as appropriate.
89
90       --autoclose <seconds>, -K <seconds>
91           Number of seconds to wait before closing finished terminal windows.
92
93       --autoquit, -q
94           Toggle automatically quitting after the last client window has
95           closed (overriding the config file).
96
97       --cluster-file '<filename>', -c '<filename>'
98           Use supplied file as additional cluster file (see also "FILES").
99
100       --cols <cols>, -x <cols>
101           Number of columns
102
103       --config-file '<filename>', -C '<filename>'
104           Use supplied file as additional configuration file (see also
105           "FILES").
106
107       --debug [[...] || <INTEGER>]
108           Enable debugging.  Either a level can be provided or the option can
109           be repeated multiple times.  Maximum level is 9.
110
111       --dump-config, -d
112           Dump the current configuration in the same format used by the
113           $HOME/.clusterssh/config file.
114
115       --evaluate '<[user@]<host>[:port]>', -e '<[user@]<host>[:port]>'
116           Display and evaluate the terminal and connection arguments to
117           display any potential errors.  The <hostname> is required to aid
118           the evaluation.
119
120       --fillscreen
121           Resize terminal windows to fill the whole available screen
122
123       --font '<font>', -f '<font>'
124           Specify the font to use in the terminal windows. Use standard X
125           font notation such as "5x8".
126
127       --help, -h
128           Show basic help text and exit
129
130       --list '[tag]', -L '[tag]'
131           List available cluster tags. Tag is optional.  If a tag is provided
132           then hosts for that tag are listed.  NOTE: format of output changes
133           when using "--quiet" or "-Q" option.
134
135       --man, -H
136           Show full help text (the man page) and exit
137
138       --master '<STRING>', -M '<STRING>'
139           The console client program polls master as the primary server,
140           rather than the default set at compile time (typically
141           ``console'').
142
143       --port <port>, -p <port>
144           Specify an alternate port for connections.
145
146       --quiet, -Q
147           Do not output extra text when using some options
148
149       --rows <rows>, -y <rows>
150           Number of rows
151
152       --show-history, -s
153           Show history within console window.
154
155       --tag-file '<filename>', -r '<filename>'
156           Use supplied file as additional tag file (see also "FILES")
157
158       --term-args '<STRING>', -t '<STRING>'
159           Specify arguments to be passed to terminals being used.
160
161       --tile, -g
162           Toggle window tiling (overriding the config file).
163
164       --title '<title>', -T '<title>'
165           Specify the initial part of the title used in the console and
166           client windows.
167
168       --unique-servers, -u
169           Toggle connecting to each host only once when a hostname has been
170           specified multiple times.
171
172       --usage, -?
173           Show synopsis and exit
174
175       --use-all-a-records, -A
176           If a hostname resolves to multiple IP addresses, toggle whether or
177           not to connect to all of them, or just the first one (see also
178           config file entry).
179
180       --version, -v
181           Show version information and exit
182

ARGUMENTS

184       The following arguments are supported:
185
186       [user@]<hostname>[:port] ...
187           Open an xterm to the given hostname and connect to the
188           administration console.  The optional port number can be used if
189           the server is not listening on the standard port.
190
191       <tag> ...
192           Open a series of xterms defined by <tag> in one of the
193           supplementary configuration files (see "FILES").
194
195           Note: specifying a username on a cluster tag will override any
196           usernames defined in the cluster.
197

KEY SHORTCUTS

199       The following key shortcuts are available within the console window,
200       and all of them may be changed via the configuration files.
201
202       Control-Shift-plus
203           Open the 'Add Host(s) or Cluster(s)' dialogue box.  Multiple host
204           or cluster names can be entered, separated by spaces.
205
206       Alt-n
207           Paste in the hostname part of the specific connection string to
208           each client, minus any username or port, e.g.
209
210           "scp /etc/hosts server:files/<Alt-n>.hosts"
211
212           would replace the <Alt-n> with the client's name in each window.
213
214       Alt-l
215           Paste in the hostname of the server cssh is being run on
216
217       Alt-q
218           Quit the program and close all connections and windows.
219
220       Alt-r
221           Retile all the client windows.
222
223       Alt-u
224           Paste in the username for the connection
225
226       Alt-1
227       Alt-2
228       Alt-3
229       Alt-4
230           Run the matching user defined macro on the server and send the
231           output to the client
232

EXAMPLES

234       Open up a session to 3 servers
235           $ ccon server1 server2 server3
236
237       Open up a session to a cluster of servers identified by the tag 'farm1'
238       and give the controlling window a specific title, where the tag is
239       defined in one of the default configuration files
240           $ ccon -T 'Web Farm Cluster 1' farm1
241
242       Connect to different servers using different login names.  NOTE: this
243       can also be achieved by setting up appropriate options in the
244       configuration files.  Do not close the console when the last terminal
245       exits.
246           $ ccon user1@server1 admin@server2
247
248       Open up a cluster defined in a non-default configuration file
249           $ ccon -c $HOME/cssh.extra_clusters db_cluster
250
251       Override the configured/default port to use 2022 instead
252           $ ccon -p 2022 server1 server2
253

FILES

255       /etc/clusters, $HOME/.clusterssh/clusters
256           These files contain a list of tags to server names mappings.  When
257           any name is used on the command line it is checked to see if it is
258           a tag.  If it is a tag, then the tag is replaced with the list of
259           servers.  The format is as follows:
260
261           <tag> [user@]<server>[:port] [user@]<server>[:port] [...]
262
263           e.g.
264
265               # List of servers in live
266               live admin1@server1 admin2@server2:2022 server3 server4
267
268           All comments (marked by a #) and blank lines are ignored.  Tags may
269           be nested, but be aware of using recursive tags as they are not
270           checked for.
271
272           Servers can be defined using expansion macros:
273
274           "webservers websvr{a,b,c}"
275
276           would be expanded to
277
278           "webservers websvra websvrb websvrc"
279
280           and
281
282           "webservers websvr{6..9}"
283
284           would be expanded to
285
286           "webservers websvr6 websvr7 websvr8 websvr9"
287
288           Extra cluster files may also be specified either as an option on
289           the command line (see "cluster-file") or in the user's
290           $HOME/.clusterssh/config file (see "extra_cluster_file"
291           configuration option).
292
293           NOTE: the last tag read overwrites any pre-existing tag of that
294           name.
295
296           NOTE: there is a special cluster tag called "default" - any tags or
297           hosts included within this tag will be automatically opened if
298           nothing is specified on the command line.
299
300       /etc/tags, $HOME/.clusterssh/tags
301           Very similar to clusters files but the definition is reversed.  The
302           format is:
303
304           <host> <tag> [...]
305
306           This allows one host to be specified as a member of a number of
307           tags.  This format can be clearer than using clusters files.
308
309           Extra tag files may be specified either as an option (see
310           "tag-file") or within the user's $HOME/.clusterssh/config file (see
311           "extra_tag_file" configuration option).
312
313           NOTE: All tags are added together
314
315       /etc/csshrc & $HOME/.clusterssh/config
316           This file contains configuration overrides - the defaults are as
317           marked.  Default options are overwritten first by the global file,
318           and then by the user file.
319
320           NOTE: values for entries do not need to be quoted unless it is
321           required for passing arguments, e.g.
322
323           "terminal_allow_send_events="-xrm '*.VT100.allowSendEvents:true'""
324
325           should be written as
326
327           "terminal_allow_send_events=-xrm '*.VT100.allowSendEvents:true'"
328
329           auto_close = 5
330               Close terminal window after this many seconds.  If set to 0
331               will instead wait on input from the user in each window before
332               closing. See also --autoclose and --no-autoclose
333
334           auto_quit = 1
335               Automatically quit after the last client window closes.  Set to
336               0 to disable.  See also --autoquit
337
338           auto_wm_decoration_offsets = no
339               Enable or disable alternative algorithm for calculating
340               terminal positioning.
341
342           command_pre =
343           command_post =
344               Add extra commands around the communication method.  For
345               example:
346
347               command_pre= . $HOME/virtualenvs/default/bin/active ;
348               command_post= | ct
349
350               would allow for using Python virtual envronments and then
351               piping all shell output through "chromaterm" for syntax
352               highlighting.  Note: you must use appropriate command
353               separators/terminators to keep the meaning of the command
354               pipline (such as ";" and "|" between commands).
355
356               These are not put through macro parsing.
357
358           comms = console
359               Sets the default communication method (initially taken from the
360               name of the program, but can be overridden here).
361
362           console_position = <null>
363               Set the initial position of the console - if empty then let the
364               window manager decide.  Format is '+<x>+<y>', i.e. '+0+0' is
365               top left hand corner of the screen, '+0-70' is bottom left hand
366               side of screen (more or less).
367
368           external_command_mode = 0600
369               File mode bits for the external_command_pipe.
370
371           external_command_pipe = <null>
372               Define the full path to an external command pipe that can be
373               written to for controlling some aspects of ClusterSSH, such as
374               opening sessions to more clusters.
375
376               Commands:
377
378               "open <tag|hostname>" - open new sessions to provided tag or
379               hostname
380
381               "retile" - force window retiling
382
383               e.g.: "echo 'open localhost'" /path/to/external_command_pipe >>
384
385           external_cluster_command = <null>
386               Define the full path to an external command that can be used to
387               resolve tags to host names.  This command can be written in any
388               language.  The script must accept a list of tags to resolve and
389               output a list of hosts (space separated on a single line).  Any
390               tags that cannot be resolved should be returned unchanged.
391
392               A non-0 exit code will be counted as an error, a warning will
393               be printed and output ignored.
394
395               If the external command is given a "-L" option it should output
396               a list of tags (space separated on a single line) it can
397               resolve
398
399           extra_cluster_file = <null>
400               Define an extra cluster file in the format of /etc/clusters.
401               Multiple files can be specified, separated by commas.  Both ~
402               and $HOME are acceptable as a reference to the user's home
403               directory, e.g.
404
405               "extra_cluster_file = ~/clusters, $HOME/clus"
406
407           extra_tag_file = <null>
408               Define an extra tag file in the format of /etc/tags.  Multiple
409               files can be specified, separated by commas.  Both ~ and $HOME
410               are acceptable as a reference to the user's home directory,
411               e.g.
412
413               "extra_tag_file = ~/tags, $HOME/tags"
414
415           key_addhost = Control-Shift-plus
416               Default key sequence to open AddHost menu.  See "KEY SHORTCUTS"
417               for more information.
418
419           hide_menu = 0
420               If set to 1, hide the menu bar (File, Hosts, Send, Help) in the
421               console.
422
423           key_clientname = Alt-n
424               Default key sequence to send cssh client names to client.  See
425               "KEY SHORTCUTS" for more information.
426
427           key_localname = Alt-l
428               Default key sequence to send hostname of local server to
429               client.  See "KEY SHORTCUTS" for more information.
430
431           key_paste = Control-v
432               Default key sequence to paste text into the console window.
433               See "KEY SHORTCUTS" for more information.
434
435           key_quit = Control-q
436               Default key sequence to quit the program (will terminate all
437               open windows).  See "KEY SHORTCUTS" for more information.
438
439           key_retilehosts = Alt-r
440               Default key sequence to retile host windows.  See "KEY
441               SHORTCUTS" for more information.
442
443           key_username = Alt-u
444               Default key sequence to send username to client.  See "KEY
445               SHORTCUTS" for more information.
446
447           key_user_1 = Alt-1
448           key_user_2 = Alt-2
449           key_user_3 = Alt-3
450           key_user_4 = Alt-4
451               Default key sequence to send user defined macros to client.  If
452               the matching macro_user_1 macro is undefined, the sequence is
453               passed straight to the terminal.  See "KEY SHORTCUTS" for more
454               information.
455
456           macro_servername = %s
457           macro_hostname = %h
458           macro_username = %u
459           macro_newline = %n
460           macro_version = %v
461           macro_user_1 = %1
462           macro_user_2 = %2
463           macro_user_3 = %3
464           macro_user_4 = %4
465               Change the replacement macro used when either using a 'Send'
466               menu item, or when pasting text into the main console.
467
468           macro_user_1_command =
469           macro_user_2_command =
470           macro_user_3_command =
471           macro_user_4_command =
472               User defined macros - the macro is run through the shell on the
473               server and the output is sent to the client.  For example,
474
475               "macro_user_1_command=echo echo macro_user_1"
476
477                           would send the text C<echo macro_user_1> into the terminal session.
478
479               "macro_user_1_command=env | grep CSSH"
480
481                           would send the CSSH environment variables to the client.
482
483               The following environment variables are set in the shell of the
484               macro process
485
486               "CSSH_SERVERNAME"
487               "CSSH_HOSTNAME"
488               "CSSH_USERNAME"
489               "CSSH_CONNECTION_STRING"
490               "CSSH_CONNECTION_PORT"
491               "CSSH_VERSION"
492           macros_enabled = yes
493               Enable or disable macro replacement.  Note: this affects all
494               the "macro_*" variables above.
495
496           max_addhost_menu_cluster_items = 6
497               Maximum number of entries in the 'Add Host' menu cluster list
498               before scrollbars are used
499
500           max_host_menu_items = 30
501               Maximum number of hosts to put into the host menu before
502               starting a new column
503
504           menu_host_autotearoff = 0
505           menu_send_autotearoff = 0
506               When set to non-0 will automatically tear-off the host or send
507               menu at program start
508
509           mouse_paste = Button-2 (middle mouse button)
510               Default key sequence to paste text into the console window
511               using the mouse.  See "KEY SHORTCUTS" for more information.
512
513           rsh = /path/to/rsh
514           ssh = /path/to/ssh
515           telnet = /path/to/telnet
516               Set the path to the specific binary to use for the
517               communication method, else uses the first match found in $PATH
518
519           rsh_args = <blank>
520           ssh_args = "-x -o ConnectTimeout=10"
521           telnet_args = <blank>
522               Sets any arguments to be used with the communication method
523               (defaults to ssh arguments).
524
525               NOTE: The given defaults are based on OpenSSH, not commercial
526               ssh software.
527
528               NOTE: Any "generic" change to the method (e.g., specifying the
529               ssh port to use) should be done in the medium's own config file
530               (see "ssh_config" and $HOME/.ssh/config).
531
532           screen_reserve_top = 0
533           screen_reserve_bottom = 60
534           screen_reserve_left = 0
535           screen_reserve_right = 0
536               Number of pixels from the screen's side to reserve when
537               calculating screen geometry for tiling.  Setting this to
538               something like 50 will help keep cssh from positioning windows
539               over your window manager's menu bar if it draws one at that
540               side of the screen.
541
542           terminal = /path/to/xterm
543               Path to the X-Windows terminal used for the client.
544
545           terminal_args = <blank>
546               Arguments to use when opening terminal windows.  Otherwise
547               takes defaults from $HOME/.Xdefaults or $HOME/.Xresources file.
548
549           terminal_chdir = 0
550               When non-0, set the working directory for each terminal as per
551               'terminal_chdir_path'
552
553           terminal_chdir_path = $HOME/.clusterssh/work/%s
554               Path to use as working directory for each terminal when
555               'terminal_chdir' is enabled.  The path provided is passed
556               through the macro parser (see the section above on
557               'macros_enabled'.
558
559           terminal_font = 6x13
560               Font to use in the terminal windows.  Use standard X font
561               notation.
562
563           terminal_reserve_top = 5
564           terminal_reserve_bottom = 0
565           terminal_reserve_left = 5
566           terminal_reserve_right = 0
567               Number of pixels from the terminal's side to reserve when
568               calculating screen geometry for tiling.  Setting these will
569               help keep cssh from positioning windows over your scroll and
570               title bars or otherwise overlapping the windows too much.
571
572           terminal_colorize = 1
573               If set to 1 (the default), then "-bg" and "-fg" arguments will
574               be added to the terminal invocation command-line.  The terminal
575               will be colored in a pseudo-random way based on the host name;
576               while the color of a terminal is not easily predicted, it will
577               always be the same color for a given host name.  After a while,
578               you will recognize hosts by their characteristic terminal
579               color.
580
581           terminal_bg_style = dark
582               If set to "dark", the terminal background will be set to black
583               and the foreground to the pseudo-random color.  If set to
584               "light", then the foreground will be black and the background
585               the pseudo-random color.  If terminal_colorize is "zero", then
586               this option has no effect.
587
588           terminal_size = 80x24
589               Initial size of terminals to use. NOTE: the number of lines
590               (24) will be decreased when resizing terminals for tiling, not
591               the number of characters (80).
592
593           terminal_title_opt = -T
594               Option used with "terminal" to set the title of the window
595
596           terminal_allow_send_events = -xrm '*.VT100.allowSendEvents:true'
597               Option required by the terminal to allow XSendEvents to be
598               received
599
600           title = cssh
601               Title of windows to use for both the console and terminals.
602
603           unmap_on_redraw = no
604               Tell Tk to use the UnmapWindow request before redrawing
605               terminal windows.  This defaults to "no" as it causes some
606               problems with the FVWM window manager.  If you are experiencing
607               problems with redraws, you can set it to "yes" to allow the
608               window to be unmapped before it is repositioned.
609
610           use_all_a_records = 0
611               If a hostname resolves to multiple IP addresses, set to 1 to
612               connect to all of them, not just the first one found.  See also
613               "--use-all-a-records"}
614
615           use_hotkeys = 1
616               Setting to 0 will disable all hotkeys.
617
618           use_natural_sort = 0
619               Windows will normally sort in alphabetical order, i.e.: host1,
620               host11, host2.  Setting to this 1 will change the sort order,
621               i.e.: host1, host2, host11. NOTE: You must have the perl module
622               Sort::Naturally installed.
623
624           user = $LOGNAME
625               Sets the default user for running commands on clients.
626
627           window_tiling = 1
628               Perform window tiling (set to 0 to disable)
629
630           window_tiling_direction = right
631               Direction to tile windows, where "right" means starting top
632               left and moving right and then down, and anything else means
633               starting bottom right and moving left and then up
634
635           NOTE: The key shortcut modifiers must be in the form "Control",
636           "Alt" or "Shift", e.g. with the first letter capitalised and the
637           rest lower case.  Keys may also be disabled individually by setting
638           to the word "null".
639
640       $HOME/.clusterssh/send_menu
641           This (optional) file contains items to populate the send menu.  The
642           default entry could be written as:
643
644             <send_menu>
645               <menu title="Use Macros">
646                   <toggle/>
647                   <accelerator>ALT-p</accelerator>
648               </menu>
649               <menu title="Remote Hostname">
650                   <command>%s</command>
651                   <accelerator>ALT-n</accelerator>
652               </menu>
653               <menu title="Local Hostname">
654                   <command>%s</command>
655                   <accelerator>ALT-l</accelerator>
656               </menu>
657               <menu title="Username">
658                   <command>%u</command>
659                   <accelerator>ALT-u</accelerator>
660               </menu>
661               <menu title="Test Text">
662                   <command>echo "ClusterSSH Version: %v%n</command>
663               </menu>
664             </send_menu>
665
666           Submenus can also be specified as follows:
667
668             <send_menu>
669               <menu title="Default Entries">
670                 <detach>yes</detach>
671                 <menu title="Hostname">
672                     <command>%s</command>
673                     <accelerator>ALT-n</accelerator>
674                 </menu>
675               </menu>
676             </send_menu>
677
678           Caveats:
679
680           There is currently no strict format checking of this file.
681           The format of the file may change in the future
682           If the file exists, the default entry (Hostname) is not added
683
684           The following replacement macros are available (note: these can be
685           changed in the configuration file):
686
687           %s  Hostname part of the specific connection string to each client,
688               minus any username or port
689
690           %u  Username part of the connection string to each client
691
692           %h  Hostname of server where cssh is being run from
693
694           %n  "RETURN" code
695
696           NOTE: requires XML::Simple to be installed
697

KNOWN BUGS

699       If you have any ideas about how to fix the below bugs, please get in
700       touch and/or provide a patch.
701
702       •   Swapping virtual desktops can cause a redraw of all the terminal
703           windows.  This is due to a lack of distinction within Tk between
704           switching desktops and minimising/maximising windows.  Until Tk can
705           tell the difference between the two events, there is no fix (apart
706           from rewriting everything directly in X).
707

TROUBLESHOOTING

709       If you have issues running ccon, first try:
710
711       "ccon -e [user@]<hostname>[:port]"
712
713       This performs two tests to confirm cssh is able to work properly with
714       the settings provided within the $HOME/.clusterssh/config file (or
715       internal defaults).
716
717       1.  Test the terminal window works with the options provided
718
719       2.  Test console works to a host with the configured arguments
720
721       Configuration options to watch for in ssh are:
722
723       •   SSH doesn't understand "-o ConnectTimeout=10" - remove the option
724           from the $HOME/.clusterssh/config file
725
726       •   OpenSSH-3.8 using untrusted ssh tunnels - use "-Y" instead of "-X"
727           or use "ForwardX11Trusted yes" in $HOME/.ssh/ssh_config (if you
728           change the default ssh options from "-x" to "-X")
729

SUPPORT AND REPORTING BUGS

731       A web site for comments, requests, bug reports and bug fixes/patches is
732       available at: <https://github.com/duncs/clusterssh>
733
734       If you require support, please run the following commands and create an
735       issue via: <https://github.com/duncs/clusterssh/issues>
736
737       "perl -V"
738
739       "perl -MTk -e 'print $Tk::VERSION,$/'"
740
741       "perl -MX11::Protocol -e 'print $X11::Protocol::VERSION,$/'"
742
743       "cat /etc/csshrc $HOME/.clusterssh/config"
744
745       Using the debug option (--debug) will turn on debugging output.  Repeat
746       the option to increase the amount of debug.  However, if possible
747       please only use this option with one host at a time, e.g. "cssh --debug
748       <host>" due to the amount of output produced (in both main and child
749       windows).
750

SEE ALSO

752       <https://github.com/duncs/clusterssh/wiki/>, "ssh", Tk::overview,
753       X11::Protocol, "perl"
754

AUTHOR

756       Duncan Ferguson, "<duncan_j_ferguson at yahoo.co.uk>"
757
759       Copyright 1999-2018 Duncan Ferguson.
760
761       This program is free software; you can redistribute it and/or modify it
762       under the terms of either: the GNU General Public License as published
763       by the Free Software Foundation; or the Artistic License.
764
765       See http://dev.perl.org/licenses/ for more information.
766
767
768
769perl v5.32.1                      2021-01-26                           CCON(1)
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