/bin/sh Can one Easily Strip Path Name from $0?

Bill Moran wmoran at potentialtech.com
Wed Nov 14 07:19:18 PST 2007

In response to Martin McCormick <martin at dc.cis.okstate.edu>:

> 	I am ashamed to admit that I have been writing shell
> scripts for about 15 years but this problem has me stumped. $0
> is the shell variable which contains the script name or at least
> what name is linked to the script. The string in $0 may or may
> not contain a path, depending upon how the script was called. It
> is easy to strip off the path if it is always there
> #! /bin/sh
> PROGNAME=`echo $0 |awk 'BEGIN{FS="/"}{print $NF}'`
> echo $PROGNAME
> That beautifully isolates the script name but if you happen to
> call the script without prepending a path name such as when the
> script is in the execution path, you get an error because there
> are no slashes in the string so awk gets confused.
> 	Is there a better way to always end up with only the script name and
> nothing else no matter whether the path was prepended or not?

basename $0

Bill Moran

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