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

NAME

6       crsh - Cluster administration tool
7

VERSION

9       This documentation is for version: 4.14
10

SYNOPSIS

12       crsh [-a '<command>'] [-K <seconds>] [-q] [-c '<filename>'] [-x <cols>]
13       [-C '<filename>'] [--debug [[...] || <INTEGER>]] [-d] [-e
14       '<[user@]<host>[:port]>'] [--fillscreen] [-f '<font>'] [-h] [-L
15       '[tag]'] [-H] [-o '<STRING>'] [-p <port>] [-Q] [-y <rows>] [-s] [-r
16       '<filename>'] [-t '<STRING>'] [-g] [-T '<title>'] [-u] [-?] [-A] [-l
17       '<username>'] [-v]
18

DESCRIPTION

20       The command opens an administration console and an xterm to all
21       specified hosts.  Any text typed into the administration console is
22       replicated to all windows.  All windows may also be typed into
23       directly.
24
25       This tool is intended for (but not limited to) cluster administration
26       where the same configuration or commands must be run on each node
27       within the cluster.  Performing these commands all at once via this
28       tool ensures all nodes are kept in sync.
29
30       Connections are opened using rsh which must be correctly installed and
31       configured.
32
33       Extra caution should be taken when editing files as lines may not
34       necessarily be in the same order;  assuming line 5 is the same across
35       all servers and modifying that is dangerous.  It's better to search for
36       the specific line to be changed and double-check all terminals are as
37       expected before changes are committed.
38
39   Further Notes
40       Please also see "KNOWN BUGS".
41
42       ·   The dotted line on any sub-menu is a tear-off, i.e. click on it and
43           the sub-menu is turned into its own window.
44
45       ·   Unchecking a hostname on the Hosts sub-menu will unplug the host
46           from the cluster control window, so any text typed into the console
47           is not sent to that host.  Re-selecting it will plug it back in.
48
49       ·   If your window manager menu bars are obscured by terminal windows
50           see the "screen_reserve_XXXXX" options in the
51           $HOME/.clusterssh/config file (see "FILES").
52
53       ·   If the terminals overlap too much see the "terminal_reserve_XXXXX"
54           options in the $HOME/.clusterssh/config file (see "FILES").
55
56       ·   When using ClusterSSH on a large number of systems to connect to a
57           single system using an SSH utility (e.g. you issue a command to to
58           copy a file using scp from the remote computers to a single host)
59           and when these connections require authentication (i.e. you are
60           going to authenticate with a password), the sshd daemon at that
61           location may refuse connections after the number "MaxStartups"
62           limit in sshd_config is exceeded.  (If this value is not set, it
63           defaults to 10).  This is expected behavior; sshd uses this
64           mechanism to prevent DoS attacks from unauthenticated sources.
65           Please tune sshd_config and reload the SSH daemon, or consider
66           using the ~/.ssh/authorized_keys mechanism for authentication if
67           you encounter this problem.
68
69       ·   If client windows fail to open, try running:
70
71           "crsh -e {single host name}"
72
73           This will test the mechanisms used to open windows to hosts.  This
74           could be due to either the "-xrm" terminal option which enables
75           "AllowSendEvents" (some terminals do not require this option, other
76           terminals have another method for enabling it - see your terminal
77           documentation) or the configuration of "rsh".
78

OPTIONS

80       Some of these options may also be defined within the configuration
81       file.  Default options are shown as appropriate.
82
83       --action '<command>', -a '<command>'
84           Run the command in each session, e.g. "-a 'vi /etc/hosts'" to drop
85           straight into a vi session.
86
87       --autoclose <seconds>, -K <seconds>
88           Number of seconds to wait before closing finished terminal windows.
89
90       --autoquit, -q
91           Toggle automatically quitting after the last client window has
92           closed (overriding the config file).
93
94       --cluster-file '<filename>', -c '<filename>'
95           Use supplied file as additional cluster file (see also "FILES").
96
97       --cols <cols>, -x <cols>
98           Number of columns
99
100       --config-file '<filename>', -C '<filename>'
101           Use supplied file as additional configuration file (see also
102           "FILES").
103
104       --debug [[...] || <INTEGER>]
105           Enable debugging.  Either a level can be provided or the option can
106           be repeated multiple times.  Maximum level is 9.
107
108       --dump-config, -d
109           Dump the current configuration in the same format used by the
110           $HOME/.clusterssh/config file.
111
112       --evaluate '<[user@]<host>[:port]>', -e '<[user@]<host>[:port]>'
113           Display and evaluate the terminal and connection arguments to
114           display any potential errors.  The <hostname> is required to aid
115           the evaluation.
116
117       --fillscreen
118           Resize terminal windows to fill the whole available screen
119
120       --font '<font>', -f '<font>'
121           Specify the font to use in the terminal windows. Use standard X
122           font notation such as "5x8".
123
124       --help, -h
125           Show basic help text and exit
126
127       --list '[tag]', -L '[tag]'
128           List available cluster tags. Tag is optional.  If a tag is provided
129           then hosts for that tag are listed.  NOTE: format of output changes
130           when using "--quiet" or "-Q" option.
131
132       --man, -H
133           Show full help text (the man page) and exit
134
135       --options '<STRING>', -o '<STRING>'
136           Specify arguments to be passed to ssh when making the connection.
137           NOTE: options for ssh should normally be put into the ssh
138           configuration file; see "ssh_config" and $HOME/.ssh/config for more
139           details.
140
141           Default: -x -o ConnectTimeout=10
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       --username '<username>', -l '<username>'
181           Specify the default username to use for connections (if different
182           from the currently logged in user).  NOTE: will be overridden by
183           <user>@<host>.
184
185       --version, -v
186           Show version information and exit
187

ARGUMENTS

189       The following arguments are supported:
190
191       [user@]<hostname>[:port] ...
192           Open an xterm to the given hostname and connect to the
193           administration console.  The optional port number can be used if
194           the server is not listening on the standard port.
195
196       <tag> ...
197           Open a series of xterms defined by <tag> in one of the
198           supplementary configuration files (see "FILES").
199
200           Note: specifying a username on a cluster tag will override any
201           usernames defined in the cluster.
202

KEY SHORTCUTS

204       The following key shortcuts are available within the console window,
205       and all of them may be changed via the configuration files.
206
207       Control-Shift-plus
208           Open the 'Add Host(s) or Cluster(s)' dialogue box.  Multiple host
209           or cluster names can be entered, separated by spaces.
210
211       Alt-n
212           Paste in the hostname part of the specific connection string to
213           each client, minus any username or port, e.g.
214
215           "scp /etc/hosts server:files/<Alt-n>.hosts"
216
217           would replace the <Alt-n> with the client's name in each window.
218
219       Alt-l
220           Paste in the hostname of the server cssh is being run on
221
222       Alt-q
223           Quit the program and close all connections and windows.
224
225       Alt-r
226           Retile all the client windows.
227
228       Alt-u
229           Paste in the username for the connection
230
231       Alt-1
232       Alt-2
233       Alt-3
234       Alt-4
235           Run the matching user defined macro on the server and send the
236           output to the client
237

EXAMPLES

239       Open up a session to 3 servers
240           $ crsh server1 server2 server3
241
242       Open up a session to a cluster of servers identified by the tag 'farm1'
243       and give the controlling window a specific title, where the tag is
244       defined in one of the default configuration files
245           $ crsh -T 'Web Farm Cluster 1' farm1
246
247       Connect to different servers using different login names.  NOTE: this
248       can also be achieved by setting up appropriate options in the
249       configuration files.  Do not close the console when the last terminal
250       exits.
251           $ crsh user1@server1 admin@server2
252
253       Open up a cluster defined in a non-default configuration file
254           $ crsh -c $HOME/cssh.extra_clusters db_cluster
255
256       Override the configured/default port to use 2022 instead
257           $ crsh -p 2022 server1 server2
258

FILES

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

KNOWN BUGS

688       If you have any ideas about how to fix the below bugs, please get in
689       touch and/or provide a patch.
690
691       ·   Swapping virtual desktops can cause a redraw of all the terminal
692           windows.  This is due to a lack of distinction within Tk between
693           switching desktops and minimising/maximising windows.  Until Tk can
694           tell the difference between the two events, there is no fix (apart
695           from rewriting everything directly in X).
696

TROUBLESHOOTING

698       If you have issues running crsh, first try:
699
700       "crsh -e [user@]<hostname>[:port]"
701
702       This performs two tests to confirm cssh is able to work properly with
703       the settings provided within the $HOME/.clusterssh/config file (or
704       internal defaults).
705
706       1.  Test the terminal window works with the options provided
707
708       2.  Test rsh works to a host with the configured arguments
709
710       Configuration options to watch for in ssh are:
711
712       ·   SSH doesn't understand "-o ConnectTimeout=10" - remove the option
713           from the $HOME/.clusterssh/config file
714
715       ·   OpenSSH-3.8 using untrusted ssh tunnels - use "-Y" instead of "-X"
716           or use "ForwardX11Trusted yes" in $HOME/.ssh/ssh_config (if you
717           change the default ssh options from "-x" to "-X")
718

SUPPORT AND REPORTING BUGS

720       A web site for comments, requests, bug reports and bug fixes/patches is
721       available at: <https://github.com/duncs/clusterssh>
722
723       If you require support, please run the following commands and create an
724       issue via: <https://github.com/duncs/clusterssh/issues>
725
726       "perl -V"
727
728       "perl -MTk -e 'print $Tk::VERSION,$/'"
729
730       "perl -MX11::Protocol -e 'print $X11::Protocol::VERSION,$/'"
731
732       "cat /etc/csshrc $HOME/.clusterssh/config"
733
734       Using the debug option (--debug) will turn on debugging output.  Repeat
735       the option to increase the amount of debug.  However, if possible
736       please only use this option with one host at a time, e.g. "cssh --debug
737       <host>" due to the amount of output produced (in both main and child
738       windows).
739

SEE ALSO

741       <https://github.com/duncs/clusterssh/wiki/>, "ssh", Tk::overview,
742       X11::Protocol, "perl"
743

AUTHOR

745       Duncan Ferguson, "<duncan_j_ferguson at yahoo.co.uk>"
746
748       Copyright 1999-2018 Duncan Ferguson.
749
750       This program is free software; you can redistribute it and/or modify it
751       under the terms of either: the GNU General Public License as published
752       by the Free Software Foundation; or the Artistic License.
753
754       See http://dev.perl.org/licenses/ for more information.
755
756
757
758perl v5.30.1                      2020-01-28                           CRSH(1)
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