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CLUBAK(1) ClusterShell User Manual CLUBAK(1)


clubak - 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
gather nodes with same output (-c is provided for dshbak(1) compatibility)
output more messages for debugging purpose
disable header block and order output by nodes
fold nodeset using node groups
optional groups.conf(5) group source to use
use alternate config file for groups.conf(5)
do not display group source prefix (always @groupname)
node / line content separator string (default: :)
faster but memory hungry mode (preload all messages per node)
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


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


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

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

# 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


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



Stephane Thiell <>


GNU Lesser General Public License version 2.1 or later (LGPLv2.1+)

2023-02-09 1.9.1