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grep using -f option

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# 1  
Old 11-16-2007
grep using -f option
Dear all

I have a file with more than one patters to search.Such as pattern.txt. I have to grep these patterns into a data file such as data.txt.how to do this ,i tried

/usr/xpg4/bin/grep -f <pattern_file> <data_file>

Its not working. why or how to search pattern file ?
# 2  
Old 11-16-2007
As double checking means - are there valid patterns in the pattern.txt ?

Quote:
The empty file con-
tains zero patterns, and therefore matches nothing.
# 3  
Old 11-16-2007
Exactly I dont know what it does internally...So can you give me how to do this using grep or fgrep...
the pattern_file contains patterns in each line,terminated by <enter>.
# 4  
Old 11-21-2007
That should work then.

Can you please post a sample file containing patterns and a sample data file?

Also the command you had executed to achieve this .
Smilie
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