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Comparing two columns

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# 1  
Old 01-01-2010
Comparing two columns
Hi,
I want to compare two columns and find out missing entries e:g
Code:
Column 1    Column 2
1                   1
2                   2
3                   13               
4
10
19
234

Results woud be 13. I will appreciate very much if anyone help me Smilie.
Last edited by radoulov; 01-01-2010 at 04:15 PM.. Reason: Please use code tags!
# 2  
Old 01-01-2010
Code:
awk '$NF != $(NF-1){print $NF}' file

# 3  
Old 01-01-2010
Code:
perl -lane 'print $F[1] if ( $F[1] && $F[1] != $F[0])'

# 4  
Old 01-01-2010
Or:

Code:
awk '$0=$1==$2?0:$2' infile

# 5  
Old 01-01-2010
Else Or:

Code:
perl -ane '$F[1]!=$F[0]&&print$F[1]' file

# 6  
Old 01-01-2010
Or:

Code:
perl -lane'print$F[1]if$F[1]&&!/(\S+)\s+\1$/' infile

Edit: Re-reading the initial question, I realized that the OP didn't specify how multiple values should be displayed Smilie
So I'm just guessing ...
Last edited by radoulov; 01-01-2010 at 07:09 PM.. Reason: @F -> $F
# 7  
Old 01-01-2010
I pretty much meant what I posted, but this will add a new line after every match, which is probably a good thing:

Code:
perl -ane '$F[1]!=$F[0]&&$F[1]&&print$F[1],"\n"' dat
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