Insert a new column with sequence number (Delimiter as comma)


 
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# 1  
Old 08-11-2015
Insert a new column with sequence number (Delimiter as comma)

Hi All,

I have a file which has data like

Code:
a,b
c,d
e,f
g,h

And I need to insert a new column at the begining with sequence no( 1 to n)

Code:
1,a,b
2,c,d
3,e,f
4,g,h

Please let me know how to acheive this in unix

Last edited by vgersh99; 08-11-2015 at 06:05 PM.. Reason: codse tags, please!
# 2  
Old 08-11-2015
Code:
awk -F, '{print FNR,$0}' OFS=, myFile

This User Gave Thanks to vgersh99 For This Post:
# 3  
Old 08-11-2015
Code:
nl -nln -s, -w1 weknowd.file
1,a,b
2,c,d
3,e,f
4,g,h

# 4  
Old 08-11-2015
If you'd like fixed-length strings of digits in the added column, you might also want to look at the nl utility, perhaps with options something like:
Code:
nl -s, -nrz -w3 file

for right-justified, zero-filled, 3-digit line numbering:
Code:
001,a,b
002,c,d
003,e,f
004,g,h

This User Gave Thanks to Don Cragun For This Post:
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