bash script alternative to grep -v

if I have lots of grep -v in my shell script will it slow it down or is there are limit to how many I can put in egrep '(word|word2|word3) ? Is there a better way to do this ?
lolaferrariAsked:
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ozoCommented:
cat > file <<END
word
word2
word3
END
grep -f file

but note that
egrep '(word|word2|word3)'
will match exactly the same as
egrep 'word'
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Gerwin Jansen, EE MVETopic Advisor Commented:
>> if I have lots of grep -v in my shell script
What are you 'greppinh' for then? A process list perhaps? Can you show an example?
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lolaferrariAuthor Commented:
Oh yes, silly me - maybe not the best example. The little script just hangs. Does the grep -f extract all the similar patterns found in file?
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Gerwin Jansen, EE MVETopic Advisor Commented:
Yes, the -f option means grep is looking in a specified file for patterns.

When your script hangs, just call it explicitly with the -xv option, you'll get to see debugging information with variable assignments etc. This should help you finding  out why the script is hanging.

For example:

bash -xv your_script
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ozoCommented:
how are you using grep in your script?
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