grep command & shell procedure's

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# 1  
Old 04-24-2001
hello, i'm trying to pluck words from a list that have exactly 3 occurances of a specified letter. I've come up with this :
grep -i .*$1.*$1.*$1.*
But this also selects words with 4 or more, any tips?

I'm putting this into a shell procedure and want to be able to add a switch before I put the letter to searched in ($1), if you could point me to the correct manual page to read up on that it would be great, I'm using bourne shell.

Thanks in advance

# 2  
Old 04-25-2001
Try using a ? instead of the * The ? is for only one character place where as * is for multiple. I think this is will work in scripts also. (Haven't written any scripts yet)
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