nl(1) - number lines of files
-b, --body-numbering=STYLE
       use STYLE for numbering body lines
-d, --section-delimiter=CC
       use CC for separating logical pages
-f, --footer-numbering=STYLE
       use STYLE for numbering footer lines
-h, --header-numbering=STYLE
       use STYLE for numbering header lines
-i, --line-increment=NUMBER
       line number increment at each line
-l, --join-blank-lines=NUMBER
       group of NUMBER empty lines counted as one
-n, --number-format=FORMAT
       insert line numbers according to FORMAT
-p, --no-renumber
       do not reset line numbers at logical pages
-s, --number-separator=STRING
       add STRING after (possible) line number
-v, --starting-line-number=NUMBER
       first line number on each logical page
-w, --number-width=NUMBER
       use NUMBER columns for line numbers
--help display this help and exit
--version
       output version information and exit