string-trim - remove trailing whitespace
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Synopsis
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    string trim [(-l | --left)] [(-r | --right)] [(-c | --chars CHARS)] [(-q | --quiet)] [STRING...]

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Description
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``string trim`` removes leading and trailing whitespace from each STRING. If ``-l`` or ``--left`` is given, only leading whitespace is removed. If ``-r`` or ``--right`` is given, only trailing whitespace is trimmed. The ``-c`` or ``--chars`` switch causes the characters in CHARS to be removed instead of whitespace. Exit status: 0 if at least one character was trimmed, or 1 otherwise.

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Examples
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    >_ string trim ' abc  '
    abc

    >_ string trim --right --chars=yz xyzzy zany
    x
    zan


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