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reverse last two columns using perl or shell

Posted on 2011-09-22
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Last Modified: 2012-06-22
I have the attached file. I want to do 2 things. 1. reverse the last two columns & 3 round all values in the last two columns to the nearest hundredth. A sample file is attached.
so4pap.txt
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Question by:libertyforall2
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6 Comments
 
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Assisted Solution

by:FishMonger
FishMonger earned 200 total points
ID: 36584932
What have you tried?
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Author Comment

by:libertyforall2
ID: 36584993
I've tried importing it into excel then saving as a text file after I switch columns. It leaves gaps between columns for certain rows and does work correctly. I simply want to switch the last two columns. uhggg.
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LVL 12

Expert Comment

by:tel2
ID: 36585229
Hi lfa2,

To put output in a 2nd file:
    perl -lane 'print "$F[0] $F[1] $F[3] $F[2]"' infile.txt >outfile.txt

To modify the input file:
    perl -i -lane 'print "$F[0] $F[1] $F[3] $F[2]"' infile.txt
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LVL 12

Expert Comment

by:tel2
ID: 36585239
Or more concisely:
    perl -lane 'print "@F[0,1,3,2]"' infile.txt >outfile.txt
or:
    perl -i -lane 'print "@F[0,1,3,2]"' infile.txt
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LVL 12

Accepted Solution

by:
tel2 earned 1800 total points
ID: 36590939
Alternatively:
    perl -pe 's/(.*) (\S+) (\S+)/$1 $3 $2/' infile.txt >outfile.txt
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Author Closing Comment

by:libertyforall2
ID: 36593052
I used the last one. It works great!
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