multiple search with grep


 
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# 1  
Old 04-03-2006
multiple search with grep

is it possible to execute multiple search with grep???

grep criteria1 criteria2 file


something like this...

I know other way:

grep pattern1 file-name1 > results-file
grep pattern2 file-name1 >> results-file
cat results-file

but can it be done with one grep????
# 2  
Old 04-03-2006
grep -E "criteria1|criteria2" file
# 3  
Old 04-03-2006
thanks I will try
# 4  
Old 04-03-2006
Or there is:

grep -e "pattern1" -e "pattern2" file
# 5  
Old 04-04-2006
You can try grep -f too....u can generalise that way, for multiple patterns
# 6  
Old 04-04-2006
egrep "pattern1|pattern2|.....|patternn" filename
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