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利用者:kusaReMKN/Nl (Unix)

nl
対応OS Unix and Unix-like
プラットフォーム Cross-platform
種別 Command
ライセンス coreutils: GPLv3+
テンプレートを表示

nl は、ファイルまたは標準入力からの入力に行番号を添えて標準出力に出力する Unix ユーティリティである。

History[編集]

nl is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the Single Unix Specification.[1] It first appeared in System V release 2.[2]

The version of nl bundled in GNU coreutils was written by Scott Bartram and David MacKenzie.[3]

Syntax[編集]

The command 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 some command line options.

Example[編集]

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

The following example numbers only the lines that begin with a capital letter A (matching on the regular expression /^A/). filename is optional.

$ nl -b p^A filename
       apple
    1  Apple
       BANANA
    2  Allspice
       strawberry

It can be useful as an alternative to grep -n:

$ cat somefile
aaaa
bbbb
cccc
dddc
$ nl somefile | grep cccc
    3 cccc

See also[編集]

References[編集]

 

External links[編集]

  1. ^ nl – The Open Group基本仕様書第7号2018年版「シェル及びユーティリティ」
  2. ^ nl(1) – FreeBSD General Commands Manual Pages (en)
  3. ^ [[[:Template:Man/ManKier]] nl(Template:Man/ManKier)] – Template:Man/ManKier
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