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Shell Programming and Scripting

modify first column

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# 1  
Old 06-14-2011
modify first column
Hi,

I am use to using awk and sed. This time I have a file that has multiple columns. It looks like this:

Code:
4  6  7  8
5  4  3  2
3  2  6  9

I want to add chr to column 1 only so it looks like this:

Code:
chr4  6  7  8
chr5  4  3  2
chr3  2  6  9

The file is tab seperated.

Thanks

Phil
# 2  
Old 06-14-2011
Code:
awk '{ $1="chr" $1; } 1' < datafile > outfile

# 3  
Old 06-14-2011
Quote:
Originally Posted by Corona688
Code:
awk '{ $1="chr" $1; } 1' < datafile > outfile

make sure you specify the OFS (as you're re-eval-ing the record):
Code:
awk '{ $1="chr" $1; } 1' OFS=\t'  < datafile > outfile

# 4  
Old 06-14-2011
Code:
awk '{$0="chr" $0}1' infile > outfile

Code:
sed -i 's/^/chr/' file

# 5  
Old 06-15-2011
Code:
bash-3.00$ sed 's/^./chr&/' /tmp/myfile
chr4  6  7  8
chr5  4  3  2
chr3  2  6  9

use sed -i to save the file with changes
# 6  
Old 06-15-2011
alternate awk solution
Code:
awk '{print "chr" $0}' OFS=\t inptufile > outfile

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