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Need to return the first occurance of a searchby mds (Novice) |
on Apr 18, 2013 at 14:59 UTC ( [id://1029372]=perlquestion: print w/replies, xml ) | Need Help?? |
mds has asked for the wisdom of the Perl Monks concerning the following question:
I need a solution that simulates the rpm -q command as follows:
The linux rpm command returns only the first occurance of what you are looking for. example: if you have cups installed rpm -q cups returns cups-1.5.2-9.fc16.x86_64 and not cups-libs-1.5.2-9.fc16.x86_64 even though cups-libs-1.5.2-9.fc16.x86_64 is installed. I loaded an array with the output of rpm -qa I need to do a search on that array (data strucuture is not important to me, it can be anything) using cups as the search string and have it only return cups-1.5.2-9.fc16.x86_64 and not anything else with cups in the string anywhere in the array. This will effectivly simulate the "rpm -q string" command. It also must return an empty set indication if only cups-libs-1.5.2-9.fc16.x86_64 exist but cups-1.5.2-9.fc16.x86_64 does not. And of course this will work with any string matched against the array. Not just cups. It's ok if the grep or match or search returns a duplicate. that is if cups-1.5.2-9.fc16.x86_64 is in the rpm data array twice its ok if it returns it into output of another array. I have been trying grep and regular expresions, but my regex is not up to solving this particular problem. Thanks, in advance.
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