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

grep -i '<searchTerm>\|<someOtherSearchTerm>' <someFileName>
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.
Sample Output
~> cat myFile.txt
hello
commandlinefu
how
are
you today?

Sincerely,
The World
~> grep -i 'hello\|world' myFile.txt
hello
The World
~>

-1
2009-05-11 23:05:54

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
Patola · 492 weeks and 2 days ago
definitely, use "egrep"
michauko · 492 weeks and 2 days ago
Or grep -i -e "term1" -e "term2"
flatcap · 492 weeks and 1 day ago
Thanks Patola! Does this work on the commandlinefu grep box ? :)
DaveQB · 492 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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