topic Re: script problem in Operating System - Linux

script problem

neocosmic — Fri, 25 Apr 2003 16:01:55 GMT

how can i put a number in front of each line in a given file?

Re: script problem

LucianoCarvalho — Fri, 25 Apr 2003 16:44:05 GMT

hi,

when you are usign "vi" editor, you can use the "set number" command to numer each line of your file.

regards

Re: script problem

John Poff — Fri, 25 Apr 2003 16:45:12 GMT

Hi,

Here are some ways to do it in sed:

# number each line of a file (simple left alignment). Using a tab (see
# note on '\t' at end of file) instead of space will preserve margins.
sed = filename | sed 'N;s/\n/\t/'

# number each line of a file (number on left, right-aligned)
sed = filename | sed 'N; s/^/ /; s/ *$.\{6,\}$\n/\1 /'

# number each line of file, but only print numbers if line is not blank
sed '/./=' filename | sed '/./N; s/\n/ /'

Courtesy of Eric Pement's wonderful One Liners for Sed.

JP

Re: script problem

John Meissner — Fri, 25 Apr 2003 17:24:03 GMT

If you mean while you are vi'ing the file you can hit escape then ":" and type "set nu" This will number each line. if you want to add actual numbers into the file you can do this:

count=1
cat file |
while read line
do
echo $count $line
((count=$count+1))
done

if you want to save this output you can send it to another file and rename it back to the original if you so wish.

Re: script problem

Jared Middleton — Sat, 26 Apr 2003 04:04:26 GMT

Here are a couple quick-and-dirty methods:

$ cat | grep -n ""
1:myline1
2:myline2
3:myline3

$ cat -n
1 myline1
2 myline2
3 myline3

-Jared

Re: script problem

Vitaly Karasik_1 — Sun, 27 Apr 2003 05:58:59 GMT

you can do it with

pr -n

too

Regards,
Vitaly

Re: script problem

Vitaly Karasik_1 — Mon, 28 Apr 2003 04:56:01 GMT

two more ways from my collegaus:

1) Tom Rosenfeld
And don't forget nl(1) the Number Line utility written for just this problem! try
$ nl files...
or see the man page for all the options.

2) Jonathan rodin
Just in case people get bored of using all the other ways, there's also:

less -N