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

NAME

6       ctel - Cluster administration tool
7

VERSION

9       This documentation is for version: 4.16
10

SYNOPSIS

12       ctel [-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] [-p <port>] [-Q] [-y <rows>] [-s] [-r '<filename>'] [-t
16       '<STRING>'] [-g] [-T '<title>'] [-u] [-?] [-A] [-v]
17
19       Also see the individual man pages for each of these utilities
20
21       ccon - Use 'console' as the communication method
22       crsh - Use 'rsh' as the communication method
23       csftp - Use 'sftp' as the communication method
24       cssh - Use 'ssh' 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 telnet 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           "ctel -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 "telnet".
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       --port <port>, -p <port>
139           Specify an alternate port for connections.
140
141       --quiet, -Q
142           Do not output extra text when using some options
143
144       --rows <rows>, -y <rows>
145           Number of rows
146
147       --show-history, -s
148           Show history within console window.
149
150       --tag-file '<filename>', -r '<filename>'
151           Use supplied file as additional tag file (see also "FILES")
152
153       --term-args '<STRING>', -t '<STRING>'
154           Specify arguments to be passed to terminals being used.
155
156       --tile, -g
157           Toggle window tiling (overriding the config file).
158
159       --title '<title>', -T '<title>'
160           Specify the initial part of the title used in the console and
161           client windows.
162
163       --unique-servers, -u
164           Toggle connecting to each host only once when a hostname has been
165           specified multiple times.
166
167       --usage, -?
168           Show synopsis and exit
169
170       --use-all-a-records, -A
171           If a hostname resolves to multiple IP addresses, toggle whether or
172           not to connect to all of them, or just the first one (see also
173           config file entry).
174
175       --version, -v
176           Show version information and exit
177

ARGUMENTS

179       The following arguments are supported:
180
181       [user@]<hostname>[:port] ...
182           Open an xterm to the given hostname and connect to the
183           administration console.  The optional port number can be used if
184           the server is not listening on the standard port.
185
186       <tag> ...
187           Open a series of xterms defined by <tag> in one of the
188           supplementary configuration files (see "FILES").
189
190           Note: specifying a username on a cluster tag will override any
191           usernames defined in the cluster.
192

KEY SHORTCUTS

194       The following key shortcuts are available within the console window,
195       and all of them may be changed via the configuration files.
196
197       Control-Shift-plus
198           Open the 'Add Host(s) or Cluster(s)' dialogue box.  Multiple host
199           or cluster names can be entered, separated by spaces.
200
201       Alt-n
202           Paste in the hostname part of the specific connection string to
203           each client, minus any username or port, e.g.
204
205           "scp /etc/hosts server:files/<Alt-n>.hosts"
206
207           would replace the <Alt-n> with the client's name in each window.
208
209       Alt-l
210           Paste in the hostname of the server cssh is being run on
211
212       Alt-q
213           Quit the program and close all connections and windows.
214
215       Alt-r
216           Retile all the client windows.
217
218       Alt-u
219           Paste in the username for the connection
220
221       Alt-1
222       Alt-2
223       Alt-3
224       Alt-4
225           Run the matching user defined macro on the server and send the
226           output to the client
227

EXAMPLES

229       Open up a session to 3 servers
230           $ ctel server1 server2 server3
231
232       Open up a session to a cluster of servers identified by the tag 'farm1'
233       and give the controlling window a specific title, where the tag is
234       defined in one of the default configuration files
235           $ ctel -T 'Web Farm Cluster 1' farm1
236
237       Connect to different servers using different login names.  NOTE: this
238       can also be achieved by setting up appropriate options in the
239       configuration files.  Do not close the console when the last terminal
240       exits.
241           $ ctel user1@server1 admin@server2
242
243       Open up a cluster defined in a non-default configuration file
244           $ ctel -c $HOME/cssh.extra_clusters db_cluster
245
246       Override the configured/default port to use 2022 instead
247           $ ctel -p 2022 server1 server2
248

FILES

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

KNOWN BUGS

694       If you have any ideas about how to fix the below bugs, please get in
695       touch and/or provide a patch.
696
697       ·   Swapping virtual desktops can cause a redraw of all the terminal
698           windows.  This is due to a lack of distinction within Tk between
699           switching desktops and minimising/maximising windows.  Until Tk can
700           tell the difference between the two events, there is no fix (apart
701           from rewriting everything directly in X).
702

TROUBLESHOOTING

704       If you have issues running ctel, first try:
705
706       "ctel -e [user@]<hostname>[:port]"
707
708       This performs two tests to confirm cssh is able to work properly with
709       the settings provided within the $HOME/.clusterssh/config file (or
710       internal defaults).
711
712       1.  Test the terminal window works with the options provided
713
714       2.  Test telnet works to a host with the configured arguments
715
716       Configuration options to watch for in ssh are:
717
718       ·   SSH doesn't understand "-o ConnectTimeout=10" - remove the option
719           from the $HOME/.clusterssh/config file
720
721       ·   OpenSSH-3.8 using untrusted ssh tunnels - use "-Y" instead of "-X"
722           or use "ForwardX11Trusted yes" in $HOME/.ssh/ssh_config (if you
723           change the default ssh options from "-x" to "-X")
724

SUPPORT AND REPORTING BUGS

726       A web site for comments, requests, bug reports and bug fixes/patches is
727       available at: <https://github.com/duncs/clusterssh>
728
729       If you require support, please run the following commands and create an
730       issue via: <https://github.com/duncs/clusterssh/issues>
731
732       "perl -V"
733
734       "perl -MTk -e 'print $Tk::VERSION,$/'"
735
736       "perl -MX11::Protocol -e 'print $X11::Protocol::VERSION,$/'"
737
738       "cat /etc/csshrc $HOME/.clusterssh/config"
739
740       Using the debug option (--debug) will turn on debugging output.  Repeat
741       the option to increase the amount of debug.  However, if possible
742       please only use this option with one host at a time, e.g. "cssh --debug
743       <host>" due to the amount of output produced (in both main and child
744       windows).
745

SEE ALSO

747       <https://github.com/duncs/clusterssh/wiki/>, "ssh", Tk::overview,
748       X11::Protocol, "perl"
749

AUTHOR

751       Duncan Ferguson, "<duncan_j_ferguson at yahoo.co.uk>"
752
754       Copyright 1999-2018 Duncan Ferguson.
755
756       This program is free software; you can redistribute it and/or modify it
757       under the terms of either: the GNU General Public License as published
758       by the Free Software Foundation; or the Artistic License.
759
760       See http://dev.perl.org/licenses/ for more information.
761
762
763
764perl v5.32.0                      2020-08-17                           CTEL(1)
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