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.\" ========================================================================
.\"
.IX Title "Size 3pm"
.TH Size 3pm "2021-01-18" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Term::Size \- Retrieve terminal size on Unix
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Term::Size;
\&
\&    ($columns, $rows) = Term::Size::chars *STDOUT{IO};
\&    ($x, $y) = Term::Size::pixels;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Term::Size is a Perl module which provides a straightforward way to
retrieve the terminal size.
.PP
Both functions take an optional filehandle argument, which defaults to
\&\f(CW*STDIN{IO}\fR.  They both return a list of two values, which are the
current width and height, respectively, of the terminal associated with
the specified filehandle.
.PP
\&\f(CW\*(C`Term::Size::chars\*(C'\fR returns the size in units of characters, whereas
\&\f(CW\*(C`Term::Size::pixels\*(C'\fR uses units of pixels.
.PP
In a scalar context, both functions return the first element of the
list, that is, the terminal width.
.PP
The functions may be imported.
.PP
If you need to pass a filehandle to either of the Term::Size
functions, beware that the \f(CW*STDOUT{IO}\fR syntax is only supported in
Perl 5.004 and later.  If you have an earlier version of Perl, or are
interested in backwards compatibility, use \f(CW*STDOUT\fR instead.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
1. Refuse to run in a too narrow window.
.PP
.Vb 1
\&    use Term::Size;
\&
\&    die "Need 80 column screen" if Term::Size::chars *STDOUT{IO} < 80;
.Ve
.PP
2. Track window size changes.
.PP
.Vb 1
\&    use Term::Size \*(Aqchars\*(Aq;
\&
\&    my $changed = 1;
\&
\&    while (1) {
\&            local $SIG{\*(AqWINCH\*(Aq} = sub { $changed = 1 };
\&
\&            if ($changed) {
\&                    ($cols, $rows) = chars;
\&                    # Redraw, or whatever.
\&                    $changed = 0;
\&            }
\&    }
.Ve
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
If there is an error, both functions return \f(CW\*(C`undef\*(C'\fR
in scalar context, or an empty list in list context.
.PP
If the terminal size information is not available, the functions
will normally return \f(CW\*(C`(0, 0)\*(C'\fR, but this depends on your system.  On
character only terminals, \f(CW\*(C`pixels\*(C'\fR will normally return \f(CW\*(C`(0, 0)\*(C'\fR.
.SH "CAVEATS"
.IX Header "CAVEATS"
Term::Size only works on Unix systems, as it relies on the
\&\f(CW\*(C`ioctl\*(C'\fR function to retrieve the terminal size. If you need
terminal size in Windows, see Term::Size::Win32.
.PP
Before version 0.208, \f(CW\*(C`chars\*(C'\fR and \f(CW\*(C`pixels\*(C'\fR used to return false on error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Term::Size::Any, Term::Size::Perl, Term::Size::ReadKey, Term::Size::Win32.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tim Goodwin, <tim@uunet.pipex.com>, 1997\-04\-23.
.SH "MANTAINER"
.IX Header "MANTAINER"
Adriano Ferreira, <ferreira@cpan.org>, 2006\-05\-19.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (C) 1997\-05\-13 by Tim Goodwin.
.PP
You may redistribute them under the same terms as Perl itself.