Nl (Unix)

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nl is a Unix utility for numbering lines, either from a file or from standard input, reproducing output on standard output.

It has a number of switches:

• a - number all lines
• t - number lines with printable text only
• n - no line numbering
• string - number only those lines containing the regular expression defined in the string supplied.

The default applied switch is t.

nl also supports a number of command line options.

[edit] Example

$ nl tf
    1  echo press cr
    2  read cr
    3  done

[edit] See also

• wc - the word count command
• cat - concatenate command (-n flag is equivalent to nl -a)
• List of Unix programs

[edit] External links

• [1] The program's manpage