Mark, That is true on the surface, but the answer is it "depends".
Convoluted internal built-in command shown is way faster especially if this script is going to be called often, rather than executing basename, which is an external command. For a perspective, replacing echo and cat, and using identical internal commands, one of my scripts went 5x faster. -- regards, Andre | http://www.varon.ca On Mon, Jun 2, 2008 at 12:10 PM, Mark David Dumlao <[EMAIL PROTECTED]> wrote: > ugh. Sounds like an ugly snippet i used to write for something. I showed it > to someone, he frowned (or I imagine he did, I looked at his face through an > internet forum), and told me to just use basename instead. > > cmd=`basename $0` is more understandable. > > On Mon, Jun 2, 2008 at 8:15 PM, fooler mail <[EMAIL PROTECTED]> wrote: >> >> On 6/2/08, Ramil Galib <[EMAIL PROTECTED]> wrote: >> > Hi all, >> > I saw in a script this line: >> > >> > cmd=${0##*/} # Command's basename >> > >> > Echoed the value of cmd and this returns -bash. >> > >> > I cant seem to figure out how this works. >> >> it is a "parameter expansion"... sub section of "expansion" section of >> bash man page in the syntax of: >> >> ${parameter##word} >> >> ${0} will return the name of a running program >> >> */ will find the last occurence "/" character and strip all the >> characters starting from the beginning upto the last occurence of "/" >> character... >> >> for example: >> >> #!/bin/bash >> >> cmd=${0##*/} >> echo $cmd >> >> save and name it to test.sh with execute permission... >> >> ${0} will give you >> /path/be/it/absolute/or/relative/depends/on/how/you/run/test.sh >> >> ${0##*/} will strip >> "/path/be/it/absolute/or/relative/depends/on/how/you/run/" and give >> you the results of "test.sh" without the qoutes... >> >> fooler. >> _________________________________________________ >> Philippine Linux Users' Group (PLUG) Mailing List >> http://lists.linux.org.ph/mailman/listinfo/plug >> Searchable Archives: http://archives.free.net.ph > > > > -- > thing. _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List http://lists.linux.org.ph/mailman/listinfo/plug Searchable Archives: http://archives.free.net.ph
