string-join - join strings with delimiter
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Synopsis
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.. synopsis::

    string join [-q | --quiet] SEP [STRING ...]
    string join0 [-q | --quiet] [STRING ...]

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Description
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``string join`` joins its *STRING* arguments into a single string separated by *SEP*, which can be an empty string. Exit status: 0 if at least one join was performed, or 1 otherwise. If ``-n`` or ``--no-empty`` is specified, empty strings are excluded from consideration (e.g. ``string join -n + a b "" c`` would expand to ``a+b+c`` not ``a+b++c``).

``string join0`` joins its *STRING* arguments into a single string separated by the zero byte (NUL), and adds a trailing NUL. This is most useful in conjunction with tools that accept NUL-delimited input, such as ``sort -z``. Exit status: 0 if at least one join was performed, or 1 otherwise.

Because Unix uses NUL as the string terminator, passing the output of ``string join0`` as an *argument* to a command (via a :ref:`command substitution <expand-command-substitution>`) won't actually work. Fish will pass the correct bytes along, but the command won't be able to tell where the argument ends. This is a limitation of Unix' argument passing.

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Examples
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::

    >_ seq 3 | string join ...
    1...2...3

    # Give a list of NUL-separated filenames to du (this is a GNU extension)
    >_ string join0 file1 file2 file\nwith\nmultiple\nlines | du --files0-from=-

    # Just put the strings together without a separator
    >_ string join '' a b c
    abc

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