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https://github.com/fish-shell/fish-shell
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74 lines
2.4 KiB
ReStructuredText
74 lines
2.4 KiB
ReStructuredText
string-split - split strings by delimiter
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=========================================
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Synopsis
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--------
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.. BEGIN SYNOPSIS
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| ``string`` split [**-m** | **--max** *MAX*] [**-n** | **--no-empty**] [**-q** | **--quiet**]
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\ \ [**-r** | **--right**] *SEP* [*STRING*...]
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| ``string`` split0 [**-m** | **--max** *MAX*] [**-n** | **--no-empty**] [**-q** | **--quiet**]
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\ \ [**-r** | **--right**] [*STRING*...]
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.. END SYNOPSIS
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Description
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-----------
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.. BEGIN DESCRIPTION
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``string split`` splits each STRING on the separator SEP, which can be an empty string. If ``-m`` or ``--max`` is specified, at most MAX splits are done on each STRING. If ``-r`` or ``--right`` is given, splitting is performed right-to-left. This is useful in combination with ``-m`` or ``--max``. With ``-n`` or ``--no-empty``, empty results are excluded from consideration (e.g. ``hello\n\nworld`` would expand to two strings and not three). Exit status: 0 if at least one split was performed, or 1 otherwise.
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Use ``-f`` or ``--fields`` to print out specific fields. Unless ``--allow-empty`` is used, if a given field does not exist, then the command exits with status 1 and does not print anything.
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See also the ``--delimiter`` option of the :ref:`read <cmd-read>` command.
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``string split0`` splits each STRING on the zero byte (NUL). Options are the same as ``string split`` except that no separator is given.
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``split0`` has the important property that its output is not further split when used in a command substitution, allowing for the command substitution to produce elements containing newlines. This is most useful when used with Unix tools that produce zero bytes, such as ``find -print0`` or ``sort -z``. See split0 examples below.
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.. END DESCRIPTION
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Examples
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--------
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.. BEGIN EXAMPLES
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::
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>_ string split . example.com
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example
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com
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>_ string split -r -m1 / /usr/local/bin/fish
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/usr/local/bin
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fish
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>_ string split '' abc
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a
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b
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c
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>_ string split --allow-empty -f1,3,5 '' abc
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a
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c
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NUL Delimited Examples
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^^^^^^^^^^^^^^^^^^^^^^
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::
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>_ # Count files in a directory, without being confused by newlines.
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>_ count (find . -print0 | string split0)
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42
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>_ # Sort a list of elements which may contain newlines
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>_ set foo beta alpha\ngamma
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>_ set foo (string join0 $foo | sort -z | string split0)
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>_ string escape $foo[1]
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alpha\ngamma
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.. END EXAMPLES
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