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78 lines
2.5 KiB
ReStructuredText
78 lines
2.5 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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.. synopsis::
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string split [(-f | --fields) FIELDS] [(-m | --max) MAX] [-n | --no-empty]
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[-q | --quiet] [-r | --right] SEP [STRING ...]
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string split0 [(-f | --fields) FIELDS] [(-m | --max) MAX] [-n | --no-empty]
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[-q | --quiet] [-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. FIELDS is a comma-separated string of field numbers and/or spans. Each field is one-indexed, and will be printed on separate lines. If a given field does not exist, then the command exits with status 1 and does not print anything, unless **--allow-empty** is used.
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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 -f1,3-4,5 '' abcd
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a
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c
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d
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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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