[GRLUG] Bash split question, ..

[Don Ellis]

On Thu, May 26, 2011 at 2:52 PM, Don Ellis <don.ellis at gmail.com> wrote:
> On Thu, May 26, 2011 at 2:35 PM, L. V. Lammert <lvl at omnitec.net> wrote:
>> I'm thinking there must be a simple way to do this in bash, ..
>>
>> Starting with:
>>
>> mailq | grep MAILER | xargs postsuper -d  ___________--
>>
>> In perl it might be something like split (' ',$1), but it seems much simpler
>> to use the built-in bash split (and more efficient since we would be doing
>> thousands a night). Unfortunately, I cannot grok any docs that make any
>> sense <g>!
>
> I think you want cut, not split!
>
> Not sure how to deal with the asterisk you mentioned.
>
>
> Also, notice that Bash 3 (echo $BASH_VERSION) has regexes:
>
> = = = = = = = = = = = = =
> #!/bin/bash
>
> variable="This is a fine mess."
> echo "$variable"
>
> # Regex matching with =~ operator within [[ double brackets ]].
> if [[ "$variable" =~ T.........fin*es* ]]
> # NOTE: As of version 3.2 of Bash, expression to match no longer quoted.
> then
>    echo "match found"
>        # match found
> fi
> = = = = = = = = = = = = =
>
> (Got that from Advanced Bash Scripting, a PDF) There are some other
> goodies there as well.

Sorry -- I forgot you said "in perl, split" -- the "cut" command in
bash can be similar to the "split" command in perl.

--Don Ellis

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