That is also a good guide. Since I have a couple of copies of the O'Reilly book I use that. Years ago I used a generic shell scripting book that covered both csh, Bourne, and ksh since at Digital I used ksh.
On 10/31/2012 08:12 AM, Joe Polcari wrote: > 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 <g...@blu.org> 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 <g...@blu.org> wrote: >>>> On 10/30/2012 10:58 AM, j...@polcari.com 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" >;g...@blu.org >>>>> >>>> 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 <g...@blu.org> >> Boston Linux and Unix >> PGP key id:3BC1EB90 >> PGP Key fingerprint: 49E2 C52A FC5A A31F 8D66 C0AF 7CEA 30FC 3BC1 EB90 >> >> >> _______________________________________________ >> Discuss mailing list >> Discuss@blu.org >> http://lists.blu.org/mailman/listinfo/discuss -- Jerry Feldman <g...@blu.org> Boston Linux and Unix PGP key id:3BC1EB90 PGP Key fingerprint: 49E2 C52A FC5A A31F 8D66 C0AF 7CEA 30FC 3BC1 EB90
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