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numbering lines in a file

 
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# 1  
Old 02-19-2012
numbering lines in a file
if we execute
Code:
:set nu

in vi mode, it displays the line numbers. so how to make this permanently in a file.
Whenever i execute cat , the line numbers should be there. please help me.
thanks
# 2  
Old 02-19-2012
1. i=1; while read x; do echo "$i $x"; i=$(($i+1));done < inputfile

2. perl -i.bak -pe 's/^/$. /' inputfile --> Original file would be retained as inputfile.bak
# 3  
Old 02-19-2012
Quote:
Originally Posted by pandeesh
if we execute
Code:
:set nu

in vi mode, it displays the line numbers. so how to make this permanently in a file.
Whenever i execute cat , the line numbers should be there. please help me.
thanks
Assuming you don't want the line numbers actually in the file, just shown when you cat the file, define an alias 'ncat' (probably not a good idea to alias cat):

Code:
alias ncat="awk '{ printf( \"%4d %s\n\", NR, \$0 ); }'"

Each time you execute something like ncat /tmp/foo the output will be prefixed with line numbers.
# 4  
Old 02-19-2012
Code:
man cat | grep -i number

# 5  
Old 02-19-2012
There is UNIX utility which job is just that:
Code:
nl file > new.file

This User Gave Thanks to bartus11 For This Post:
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