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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?
# 8  
Old 01-24-2014
man nl ?
# 9  
Old 01-24-2014
Thanks RudiC, I have gone through the man page for nl
and able to understand the command now.

Code:
-v Number
            Sets the initial logical-page line number to the value specified by the Number variable. The default value of the Number variable is 1. The range of the
            Number variable is from 0 to 32767.
-i Number
            Increments logical-page line numbers by the number specified in the Number variable. The default value of the Number variable is 1. The range of the
            Number variable is from 1 to 250.
-n Format
            Uses the value of the Format variable as the line numbering format. Recognized formats are:
              ln
                   Left-justified, leading zeros suppressed


Thanks,
R. Singh
# 10  
Old 01-24-2014
Quote:
Originally Posted by RudiC
Code:
awk '$0=(NR-1)*5" " $0' file

Shedding a few more characters:
Code:
awk '$0=i++*5" "$0' file

There's a way to reduce it by at least one more character. Does anyone see it?

Regards,
Alister
# 11  
Old 01-25-2014
Code:
awk '$0=i+=5" "$0' file

(not tested, I'm on my phone)
# 12  
Old 01-27-2014
Quote:
Originally Posted by tukuyomi
Code:
$0=i+=5" "$0

That won't work.

In that expression, string concatenation has highest precedence, so, firstly, 5" "$0 is joined. Then, while converting the just-concatenated string to a numeric, += truncates it at the first space, discarding the entire record, $0.

Your suggestion is equivalent to $0=i+=5. Aside from the discarded data, this generates an arithmetic sequence which begins at 5, not 0.

Regards,
Alister
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