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Shell Programming and Scripting

how to add new col in a file

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# 1  
Old 01-09-2011
how to add new col in a file
Hi, Experts,
I have a requirement as following:
my source file:
a
a
a
b
b
c
c
c
c
I need add one more colume as following:
1 a
2 a
3 a
1 b
2 b
1 c
2 c
3 c
4 c

anybody can help me out.

Thanks in advance
ken002
# 2  
Old 01-09-2011
what have you tried so far? What are you trying to write it in? awk, shell, Perl?
# 3  
Old 01-09-2011
First attempt:

Code:
uniq -c ttt|while read n c;do i=1; while ((i<=n));do echo "$i $c";((i=i+1));done

(korn shell)
Last edited by jlovi; 01-09-2011 at 10:54 PM..
# 4  
Old 01-09-2011
Try...
Code:
awk '{print ++a[$1], $1}' file1

# 5  
Old 01-09-2011
Yeah, not clear.

Which behavior required when a a a b a?
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