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How to add line numbers (multiples of 5: 0,5,10,15,20) to a text file?

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Top Forums Shell Programming and Scripting How to add line numbers (multiples of 5: 0,5,10,15,20) to a text file?
# 1  
Old 01-23-2014
Code How to add line numbers (multiples of 5: 0,5,10,15,20) to a text file?
Hi,

I need to number the lines in my text file. I know how to do this with standard numbering (1,2,3,4, etc) but I need to count in multiples of 5, beginning 0,5,10,15...

example existing file:
Code:
abcd
efg
hijklm
nopqrs

desired output
Code:
0        abcd
5       efg
10    hijklm
15    nopqrs

etc.

Please advise. Can I use awk? Crucially it MUST begin with 0!

Thanks in advance.Smilie
Last edited by Franklin52; 01-23-2014 at 11:17 AM.. Reason: Please use code tags
# 2  
Old 01-23-2014
Hello,

Could you please use code tage as per the forum rules.
Here is the solution that may help you.

Code:
awk 'NR==1{i=0} {print i " "$0} {i=i+5}' check_file_count5

Output will be as follows.

Code:
0 abcd
5 efg
10 hijklm
15 nopqrs


Thanks,
R. Singh
# 3  
Old 01-23-2014
Thank you!
Thank you so much! I apologise for my misuse of the code tags.
# 4  
Old 01-23-2014
Try also
Code:
awk '{print (NR-1)*5, $0}' file
0 abcd
5 efg
10 hijklm
15 nopqrs

or
Code:
awk '$0=(NR-1)*5" " $0' file

# 5  
Old 01-23-2014
On Linux:
Code:
nl -v 0 -i 5 file

This User Gave Thanks to fpmurphy For This Post:
Yoda
# 6  
Old 01-23-2014
Also if required, add -n option to format (ln - left justified, leading zeroes suppressed):
Code:
nl -v0 -i5 -nln file

# 7  
Old 01-24-2014
Quote:
Posted by Yoda:
Also if required, add -n option to format (ln - left justified, leading zeroes suppressed):


Code:
nl -v0 -i5 -nln file
Hello Yoda,

Could you please explain the code.

Thanks,
R. Singh
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