1. Name

nl [man page] - number lines of files

2. Synopsis

nl [OPTION]... [FILE]... 

3. Frequently used options

-b, --body-numbering=STYLE
use STYLE for numbering body lines
-f, --footer-numbering=STYLE
use STYLE for numbering footer lines
-h, --header-numbering=STYLE
use STYLE for numbering header lines

4. Examples

$ echo -e "one\ntwo\nthree\nfour\nfive\n\nsix" > file 

nl - create a sample file

$ nl file 

nl - add line numbers

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