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[Discuss] What the use of .bashrc
- Subject: [Discuss] What the use of .bashrc
- From: jabr at gapps.blu.org (John Abreau)
- Date: Wed, 31 Oct 2012 08:28:03 -0400
- In-reply-to: <34663AF8-16D1-4476-916A-64AF22E98BD7@polcari.com>
- References: <1351609109.v2.mailanyonewebmail-496295@fuseweb2f> <508FED34.3090706@blu.org> <CAFv2jcatMnWTJFC7JioF2_EPH+LVovNrmF31VfLTHXtSHcwHYg@mail.gmail.com> <508FFB7B.20905@blu.org> <34663AF8-16D1-4476-916A-64AF22E98BD7@polcari.com>
It was just a simple oversight on my part. I failed to notice that the case statement wrapped $PATH in colons, and as a result I mistakenly thought Jerry was claiming that bash exhibits a magical and non-intuitive special case for globbing on the PATH variable. But it wasn't a magical special case, just a bit of sleight-of-hand at the start. Sent from my iPad On Oct 31, 2012, at 8:12 AM, Joe Polcari <joe at polcari.com> 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 <gaf at 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 <gaf at blu.org> wrote: >>>> On 10/30/2012 10:58 AM, joe at 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" >;gaf at 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 <gaf at 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 at blu.org >> http://lists.blu.org/mailman/listinfo/discuss > _______________________________________________ > Discuss mailing list > Discuss at blu.org > http://lists.blu.org/mailman/listinfo/discuss
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- [Discuss] What the use of .bashrc
- From: joe at polcari.com (joe at polcari.com)
- [Discuss] What the use of .bashrc
- From: gaf at blu.org (Jerry Feldman)
- [Discuss] What the use of .bashrc
- From: abreauj at gmail.com (John Abreau)
- [Discuss] What the use of .bashrc
- From: gaf at blu.org (Jerry Feldman)
- [Discuss] What the use of .bashrc
- From: joe at polcari.com (Joe Polcari)
- [Discuss] What the use of .bashrc
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