Unix Tip: SEPARATE SHELL COMMAND HISTORY FILES

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Unix Tip 3161 - October 2, 2009

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SEPARATE SHELL COMMAND HISTORY FILES

In any X based desktop when the number of pseudo terminal windows are more then one, the common shell history file (KSH) becomes a nuisance. Here is a way to have separate, safe and limited shell command history files.

Put the following code in your shell RC file.

--------------------------------CODE START------------------------------------
# Form a unique name for the shell history file using the tty output and
# set the shell variable HISTFILE to point to that
# This solves the problem of mutiple shells using the same history file
# and causing the confusion....
histf=`tty | awk 'BEGIN {FS="/"; nm=".shist_"} { for (i=1; i<=NF; i++) nm = nm
$i;} END { print nm;} '`
export HISTFILE=$histf
\rm -f $histf
echo History file is $histf...
--------------------------------CODE END------------------------------------

This tip generously supported by: atulk@informix.com

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