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case-insensitive if on substring

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# 1  
Old 07-27-2009
case-insensitive if on substring
I'd like to print a line if a substring is matched in a case insensitive manner

something like do a case insensitive search for ABCD as a substring:

awk '{ if (substr($1,1,4) == "[Aa][Bb][Cc][Dd]") print $1 }' infile > outfile

I'm not certain how to make the syntax work???

Thanks
# 2  
Old 07-27-2009
use toupper or tolower functions of awk..
# 3  
Old 07-27-2009
I'm not certain how that works. I'm new. I want the outfile to retain the case that was in the infile as well.

Thanks again.
# 4  
Old 07-27-2009
this might help.
# 5  
Old 07-27-2009
Oh I get it...

awk '{ if toupper((substr($1,1,4)) == "ABCD") print $1 }' infile > outfile

Thanks you rule!!!
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