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[diff] hide missing rows, show similar

 
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Top Forums UNIX for Dummies Questions & Answers [diff] hide missing rows, show similar
# 1  
Old 02-16-2012
[diff] hide missing rows, show similar
Hi all!
Having the following two csv files:

file1
Code:
AAA;0000;RED
CCC;9900;GREEN

file2
Code:
AAA;0000;BLACK
BBB;0099;BLU

What's the correct syntax to hide only the missing rows (BBB,CCC) and show the rows that differ only with last field?

I expect something like this:
Code:
diff <options> file1 file2
< AAA;0000;RED
> AAA;0000;BLACK

Also, is it possible to show an output like this directly with diff?
Code:
AAA;0000;RED;BLACK

Thank you very much!
Evan
# 2  
Old 02-16-2012
diff, as its name implies, shows differing lines.

If you want lines in common, there's a different utility for that, comm. It outputs three columns, lines unique to file1, lines unique to file2, and lines common to both. You can suppress any of these, so:

Code:
comm -1 -2 file1 file2

should print only lines that appear in both.
# 3  
Old 02-16-2012
Code:
comm -12 file1 file2

will print lines that appear in both

Code:
comm -13 file1 file2

will print lines that appear only in file2

Code:
comm -23 file1 file2

will print lines that appear only in file1

Code:
comm -3 file1 file2

will write on the left lines that appear only in file1 and on the right lines that appear only in file2
 
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