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Grep a file pattern in another

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# 8  
Old 10-08-2013
It worked fine...Thanks a lot Scrutinizer
# 9  
Old 10-08-2013
Hi,
Another way with grep and xargs (as sed Scrutinizer solution):
1) xargs posix:
Code:
grep -Ef <(cat file1 | xargs -I {} printf "(^|[[:space:]]){}([[:space:]]|$)\n") file2

2) xargs gnu:
Code:
grep -Ef <(xargs -a file1 -I {} printf "(^|[[:space:]]){}([[:space:]]|$)\n") file2

Regards.
This User Gave Thanks to disedorgue For This Post:
flyfisherman
# 10  
Old 10-08-2013
Every grep suggestion thus far in this thread (including the OP's) assumes that it is safe to evaluate file1 in a regular expression context. If file1 does not contain regular expressions (very likely), and if its literal text may contain regular expression metacharacters (possible), that assumption would be unjustified and could yield erroneous output.

The assumption may be valid (probably is), but given the miniscule data sample and lack of specifics in the OP, I thought it prudent to mention it.

Regards,
Alister
Last edited by alister; 10-08-2013 at 09:33 PM..
This User Gave Thanks to alister For This Post:
disedorgue
# 11  
Old 10-09-2013
I agree, and with these grep suggestions there is then also sensitivity to spacing in file1 (one leading or trailing space somewhere in the file will influence the result, which may not be desirable) so generally I would prefer the awk approach.
# 12  
Old 10-09-2013
Thank you guys! You're just fantastic! It resolved my problem.
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