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Do an OR search using grep to look for more than one search term

Terminal - Do an OR search using grep to look for more than one search term
grep -i '<searchTerm>\|<someOtherSearchTerm>' <someFileName>
2009-05-11 23:05:54
User: scifisamurai
Functions: grep
-1
Do an OR search using grep to look for more than one search term

This is a simple but useful command to search for multiple terms in a file at once. This prevents you from having to do mutliple grep's of the same file.

Alternatives

There are 2 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

This command is wrong. Most unixes do not have 'extended regular expression' operators (which include OR) on regular grep, only on extended grep (egrep) where this operator can not be quoted (preceded by a \). So, while in Linux this works, on AIX for example it does not.

The correct, portable way to do it would be:

egrep 'expression1|expression2' filename
Comment by Patola 292 weeks and 5 days ago

definitely, use "egrep"

Comment by michauko 292 weeks and 5 days ago

Or

grep -i -e "term1" -e "term2"
Comment by flatcap 292 weeks and 5 days ago

Thanks Patola!

Does this work on the commandlinefu grep box ? :)

Comment by DaveQB 292 weeks and 4 days ago

Your point of view

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