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Compare two text files and print matches

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# 8  
Old 01-14-2012
Quote:
Originally Posted by Scrutinizer
Have you tried ahamed's suggestions? They should work if your input file is anything like you described. What do you mean with no structure? What you have posted so far is two files with 2 fields per line. The first field is a serial number followed by a dot, the second is a number of arbitrary length. Is this correct or does the structure deviate from this?

Ahh man, my apologies those were meant to be line numbers, they were not necessary. My text editor notes the line numbers and I added them to my original post without realising Ahamed's suggestion took it into consideration. My bad, I have now removed them. Smilie
# 9  
Old 01-14-2012
Code:
awk 'NR==FNR{a[$1];next}$1 in a{print}' file1 file2

or

Code:
grep -f file1 file2

When I copied your contents, there were spaces at the end of some lines (and that is probably the reason why grep didn't work), if that is the case use awk else the grep should do the job!

--ahamed
# 10  
Old 01-14-2012
And if there are no double entries in the first file then this should work too:
Code:
awk 'A[$1]++' file1 file2

# 11  
Old 01-14-2012
Thanks guys, the awk statements are working well now!
# 12  
Old 01-15-2012
Can any one give me the whole programming for this need in perl?? please
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