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Re: [PLUG] Building a command from variables in BASH
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- From: Edmond Rodriguez <erodrig97.list@gmail.com>
- To: "Philadelphia Linux User's Group Discussion List" <plug@lists.phillylinux.org>
- Subject: Re: [PLUG] Building a command from variables in BASH
- Date: Thu, 16 Sep 2010 15:03:35 -0400
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- Reply-to: Philadelphia Linux User's Group Discussion List <plug@lists.phillylinux.org>
- Sender: plug-bounces@lists.phillylinux.org
Here is an example I tried:
export B= " | xargs -i echo 'line was: {}' "
bash -c "echo hello $B"
Results in: line was: hello
On Thu, Sep 16, 2010 at 2:46 PM, Isaac Bennetch <bennetch@gmail.com> wrote:
> Hi,
>
> On 9/16/2010 2:40 PM, Michael Bevilacqua wrote:
> ...
>>
>> To test, I do:
>>
>> echo $VCIDS
>>
>> and I get exactly what I want in the string:
>>
>> | sed -e s/ orarcrc01<->cdp1crc02/ 100000 orarcrc01<->cdp1crc02/g | sed
>> -e s/ sdgdcrc01<->cdc1crc02/ 100001 sdgdcrc01<->cdc1crc02/g | sed -e s/
>> cindcrc01<->cdc1crc02/ 100002 cindcrc01<->cdc1crc02/g | sed -e s/
>> akrdcrc01<->cdp1crc02/ 100003 akrdcrc01<->cdp1crc02/g | sed -e s/
>> daldcrc01<->cdp1crc01/ 100004 daldcrc01<->cdp1crc01/g | sed -e s/
>> ausrcrc01<->cdc1crc01/ 100005 ausrcrc01<->cdc1crc01/g | sed -e s/
>> syrrcrc01<->cdc1crc01/ 100006 syrrcrc01<->cdc1crc01/g | sed -e s/
>> manrcrc01<->cdp1crc01/ 100007 manrcrc01<->cdp1crc01/g | sed -e s/
>> cdc1crc01<->cdp1crc01/ 100014 cdc1crc01<->cdp1crc01/g | sed -e s/
>> cdc1crc02<->cdp1crc02/ 100015 cdc1crc02<->cdp1crc02/g
>>
>>
>>
>> So, now I want to rebuild that original ugly line and execute it, so I do:
>>
>> exec "cat $FILE1 $VCIDS > $FILE2"
>
> My first thought is:
> exec "cat $FILE1 `echo $VCIDS` > $FILE2"
> Or am I over-simplifying the problem?
> ~isaac
>
>> And it fails because $VCIDS is no longer a command, it is now a string,
>> so cat wants to read it as so.
>
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>
___________________________________________________________________________
Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
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