If bash can do it, it's in this guide, my bash bible: http://www.tldp.org/LDP/abs/abs-guide.pdf
Sent from my iPad On Oct 30, 2012, at 12:08 PM, Jerry Feldman <[email protected]> wrote: > I generally use "Learning the BASH Shell" as a reference, but here is > the definition: > http://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion > > > > On 10/30/2012 11:46 AM, John Abreau wrote: >> I just looked for that in the bash manpage, and i can't find anything >> describing >> that behavior. Can you highlight where you discovered that? >> >> >> >> On Tue, Oct 30, 2012 at 11:07 AM, Jerry Feldman <[email protected]> wrote: >>> On 10/30/2012 10:58 AM, [email protected] wrote: >>>> Looks to me like the first test only tests if $1 is not at the end of >>>> $PATHor am I missing something? ----- Original Message -----From: >>>> "Jerry Feldman" >;[email protected] >>>> >>> No, it tests is $1 exists in $PATH. >>> I really hate bash pattern matching because I have to read the manual >>> every time I use them. >>> in this case '*:"$1":*' looks for $1 anywhere in $PATH. >> >> > Look at expressions. A path is delimited by colons. So, this means look > for $1 anywhere in a path. You can easily test it. I have not looked at > some of the boundary cases, but they appear to work since I've been > using this for years. > > case ":${PATH}:" in > *:"$1":*) > ;; > Note that $PATH is prepended and appended by ':'. So, assume a PATH is > $HOME/bin/usr/bin, the pattern is ":$HOME/bin:/usr/bin:" > So, it will look for $1 anywhere between 2 colons. > http://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion > > > -- > Jerry Feldman <[email protected]> > Boston Linux and Unix > PGP key id:3BC1EB90 > PGP Key fingerprint: 49E2 C52A FC5A A31F 8D66 C0AF 7CEA 30FC 3BC1 EB90 > > > _______________________________________________ > Discuss mailing list > [email protected] > http://lists.blu.org/mailman/listinfo/discuss _______________________________________________ Discuss mailing list [email protected] http://lists.blu.org/mailman/listinfo/discuss
