clubak - Man Page

format output from clush/pdsh-like output and more


clubak [ Options ]


clubak formats text from standard input containing lines of the form "node:output".  It is fully backward compatible with dshbak(1) but provides additional features. For instance, clubak always displays its results sorted by node/nodeset.

You do not need to use clubak when using clush(1) as all output formatting features are already included in. It is provided for other usages, like post-processing results of the form "node:output".

Like clush(1), clubak uses the ClusterShell.MsgTree module of the ClusterShell library (see pydoc ClusterShell.MsgTree).


clubak should be started with connected standard input.



show clubak version number and exit

-b,  -c

gather nodes with same output (-c is provided for dshbak(1) compatibility)

-d,  --debug

output more messages for debugging purpose


disable header block and order output by nodes

-r,  --regroup

fold nodeset using node groups


optional groups.conf(5) group source to use


use alternate config file for groups.conf(5)

-G,  --groupbase

do not display group source prefix (always @groupname)


node / line content separator string (default: :)

-F,  --fast

faster but memory hungry mode (preload all messages per node)

-T,  --tree

message tree trace mode; switch to enable ClusterShell.MsgTree trace mode, all keys/nodes being kept for each message element of the tree, thus allowing special output gathering


clush can use NO_COLOR, CLICOLOR and CLICOLOR_FORCE environment variables. --color command line option always takes precedence over environment variables. NO_COLOR takes precedence over CLICOLOR_FORCE which takes precedence over CLICOLOR. --color tells whether to use ANSI colors to surround node or nodeset prefix/header with escape sequences to display them in color on the terminal. WHENCOLOR is never, always or auto (which use color if standard output refers to a terminal). Color is set to [34m (blue foreground text) and cannot be modified.


show diff between gathered outputs

Exit Status

An exit status of zero indicates success of the clubak command.



clubak can be used to gather some recorded clush(1) results:

Record clush(1) results in a file:
# clush -w node[1-7] uname -r >/tmp/clush_output
# clush -w node[32-159] uname -r >>/tmp/clush_output
Display file gathered results (in line-mode):
# clubak -bL </tmp/clush_output

Another example, iterate over node* text files in current directory and gather characters count for all of them:

# find -name "node*" -exec wc -c {} ; | awk '{ gsub("./","",$2); print $2": "$1 }' | clubak -bL
node[1,3]: 7
node2: 9

See Also

cluset(1), clush(1), nodeset(1), groups.conf(5).

Bug Reports

Use the following URL to submit a bug report or feedback:


Stephane Thiell <>

Referenced By

cluset(1), clush(1), groups.conf(5), nodeset(1).

2023-09-29 1.9.2 ClusterShell User Manual