How to insert an incremented line count?

[KevinO]

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Josef Lowder wrote:
> How can one insert an incremented line count number 
> at the beginning of every line of a text file? 
> 
> A shell script that I had on my old unix system used to do 
> something like this, but I can't get it to work on my current 
> linux system. 
> 
> # increment - increments line-sequence numbers 
> 
> grep -v "=" $1 ^
> grep -n '^' ^
> sed 's/^\([1-9]\):\(.*\)/000\1:\2/
> s/^\([1-9][0-9]\):\(.*\)/00\1:\2/
> s/^\([1-9][0-9][0-9]\):\(.*\)/0\1:\2/
> s/^\([0-9][0-9][0-9][0-9]\):\(.*\)\.\([0-9][0-9][0-9][0-9]\)\(.*\)/\2\.\1\4/'
> 
> 
$ cat add_line_numbers
#!/bin/bash
let a=1
while read input_line
do echo $a'>'$input_line
let a=a+1
done

add_line_numbers < input_file

- --
KevinO
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