nl - is used for numbering lines, accepting input either from a file or
from STDIN
$ cat file.txt
Apache
Squid
Samba
DNS
DHCP
To display a file with line numbers
$ nl file.txt
To number all lines including empty lines
$ nl -b a file.txt
To make line number increment at each line
$ nl -i 2 file.txt
$ nl -i 3 file.txt
To make the starting line number different
$ nl -v 5 file.txt
To add a string lafter line numbers
$ nl -s "..." file.txt
$ nl -s "###" file.txt
To change column for line numbers
$ nl -w2 file.txt
$ nl -w3 file.txt
To print the lines using a different number format
$ nl -n ln file.txt
$ nl -n rn file.txt
$ nl -n rz file.txt
regards,
T.Dhanasekar
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