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Old 03-18-2004, 12:29 AM   #1
davidas
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What does rpm -qa |grep th* (as compared to rpm -qa |grep th) display?


rpm -qa |grep th displays packages with "th" in their name.

What do rpm -qa |grep th* and rpm -qa |grep *th display? I don't quite understand the output. rpm -qa |grep th* seems to display any package with "t" in the name?!

Some concept teaching required here

Thanks !
 
Old 03-18-2004, 12:43 AM   #2
Demonbane
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Grep takes regular expressions, so "grep th*" is actually equivalent to "any line that has the letter 't' and any number of 'h'(including 0)".
If you want to grep for packages that start with "th", try
Code:
rpm -qa | grep ^th
 
Old 03-18-2004, 01:35 AM   #3
davidas
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Could you elaborate on "regular expressions"? Does "grep th3" refers to "any line that has the letter 't' and 3 instances of 'h'"?

Thanks !

Quote:
Originally posted by Demonbane
Grep takes regular expressions, so "grep th*" is actually equivalent to "any line that has the letter 't' and any number of 'h'(including 0)".
If you want to grep for packages that start with "th", try
Code:
rpm -qa | grep ^th

Last edited by davidas; 03-18-2004 at 02:16 AM.
 
  


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