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Old 02-09-2006, 08:12 PM   #1
Registered: Sep 2004
Location: Baltimore, Md
Distribution: Red Hat
Posts: 47

Rep: Reputation: 15
pattern matching question - grep

I am trying to grep for a pattern (as01dc intel Diff) in a file called "formatted.fle". The pattern in a variable called "input_record" which is read from a file.

I have attempted several methods but no success

grep "$input_record" formatted_input.fle
as01dc intel Diff 8251092
ias01dc intel Diff 96428
was01dc intel Diff 941104

The only valid one is the as01dc line

So to isolate that I try

grep - x "$input_record" formatted_input.fle

it returns nothing

grep "^as01dc intel Diff" formatted_input.fle

as01dc intel Diff 8251092
which is OK but it needs to be a variable after that carat.

grep "^$input_record" formatted_input.fle

returns nothing

I don't understand why the -x doesn't work. I don't understand how to use the carat.

I am but in 3 days I have not figured it out
Old 02-09-2006, 08:30 PM   #2
Registered: Jun 2005
Location: Indiana, USA
Distribution: OpenBSD, Ubuntu
Posts: 892

Rep: Reputation: 41
Try using the -w option to have grep match on complete words: grep -w "$pattern" file


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