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02d82dcf85
Adds synopses for those commands missing them. Moves all synopsis sections to code blocks. This improves the appearance, although highlighting as fish code may not be the ideal appearance.
49 lines
816 B
ReStructuredText
49 lines
816 B
ReStructuredText
.. _cmd-isatty:
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isatty - test if a file descriptor is a tty.
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============================================
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Synopsis
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--------
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::
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isatty [FILE DESCRIPTOR]
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Description
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-----------
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``isatty`` tests if a file descriptor is a tty.
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``FILE DESCRIPTOR`` may be either the number of a file descriptor, or one of the strings ``stdin``, ``stdout``, or ``stderr``.
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If the specified file descriptor is a tty, the exit status of the command is zero. Otherwise, the exit status is non-zero. No messages are printed to standard error.
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Examples
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--------
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From an interactive shell, the commands below exit with a return value of zero:
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isatty
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isatty stdout
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isatty 2
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echo | isatty 1
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And these will exit non-zero:
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::
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echo | isatty
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isatty 9
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isatty stdout > file
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isatty 2 2> file
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