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\section isatty isatty - test if the specified file descriptor is a tty
\subsection isatty-synopsis Synopsis
<tt>isatty [FILE DESCRIPTOR]</tt>
\subsection isatty-description Description
The <tt>isatty</tt> command is used to test if a file descriptor is a tty.
FILE DESCRIPTOR may be either the number of a file descriptor, or one of the
strings stdin, stdout and stderr.
If the specified file descriptor is a tty, the exit status of the command is
zero, otherwise, it is non-zero.
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