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Adding a column to a text file based on mathematical manipulation

 
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# 1  
Old 08-22-2012
Adding a column to a text file based on mathematical manipulation
Hi,

I have a tab delimited text file with three different columns. I want to add an extra column to the text file. The extra column will be the second column and it will equal third column - 1. How do I go about doing that? Thanks!

Input:
Code:
chr1    788822  rs11240777
chr1    1008567 rs9442372
chr1    1148140 rs3813199
chr1    1148494 rs6603781

Output:
Code:
chr1  788821  788822  rs11240777
chr1  1008566  1008567 rs9442372
chr1  1148139  1148140 rs3813199
chr1  1148493  1148494 rs6603781

# 2  
Old 08-22-2012
If the file is fixed in this format, then here's an easy way:

Code:
awk '{print $1"\t"$2-1"\t"$2"\t"$3}' file 

chr1	788821	            788822	           rs11240777
chr1	1008566	1008567	rs9442372
chr1	1148139	1148140	rs3813199
chr1	1148493	1148494	rs6603781

# 3  
Old 08-24-2012
Code:
awk '{print $1,$2-1,$2,$3}' filename

 
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