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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
<tt>isatty</tt> tests if a file descriptor is a tty.
<tt>FILE DESCRIPTOR</tt> may be either the number of a file descriptor, or one of the
strings <tt>stdin</tt>, \c stdout and <tt>stderr</tt>.
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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