[Discuss] What the use of .bashrc

[Jerry Feldman]

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 <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
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>>
>>
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-- 
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix
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