resize Man page

RESIZE(1) X Window System RESIZE(1)


resize – set environment and terminal settings to current xterm window


resize [ -v | -u | -c ] [ -s [ row col ] ]


Resize prints a shell command for setting the appropriate environment
variables to indicate the current size of xterm window from which the
command is run.

Resize determines the command through several steps:

· first, it finds the name of the user’s shell program. It uses the
SHELL variable if set, otherwise it uses the user’s data from

· then it decides whether to use Bourne shell syntax or C-Shell syn‐
tax. It uses a built-in table of known shells, which can be over‐
ridden by the -u and -c options.

· then resize asks the operating system for the terminal settings.
This is the same information which can be manipulated using stty.

· then resize asks the terminal for its size in characters. Depend‐
ing on whether the “-s option is given, resize uses a different
escape sequence to ask for this information.

· at this point, resize attempts to update the terminal settings to
reflect the terminal window’s size in pixels:

· if the -s option is used, resize then asks the terminal for its
size in pixels.

· otherwise, resize asks the operating system for the information
and updates that after ensuring that the window’s dimensions
are a multiple of the character height and width.

· in either case, the updated terminal settings are done using a
different system call than used for stty.

· then resize updates the terminal settings to reflect any altered
values such as its size in rows or columns. This affects the val‐
ues shown by stty.

· finally, resize writes the shell command for setting the environ‐
ment variables to the standard output.

For resize’s output to take effect, resize must either be evaluated as
part of the command line (usually done with a shell alias or function)
or else redirected to a file which can then be read in. From the C
shell (usually known as /bin/csh), the following alias could be defined
in the user’s .cshrc:

% alias rs ‘set noglob; eval `resize`’

After resizing the window, the user would type:

% rs

Users of versions of the Bourne shell (usually known as /bin/sh) that
don’t have command functions will need to send the output to a tempo‐
rary file and then read it back in with the “.” command:

$ resize > /tmp/out
$ . /tmp/out


The following options may be used with resize:

-c This option indicates that C shell commands should be generated
even if the user’s current shell is not /bin/csh.

-s [rows columns] This option indicates that Sun console escape sequences will be
used instead of the VT100-style xterm escape codes. If rows
and columns are given, resize will ask the xterm to resize
itself using those values.

Both of the escape sequences used for this option (first to
obtain the window size and second to modify it) are subject to
xterm’s allowWindowOps resource setting. The window manager
may also choose to disallow the change.

The VT100-style escape sequence used to determine the screen
size always works for VT100-compatible terminals. VT100s have
no corresponding way to modify the screensize.

-u This option indicates that Bourne shell commands should be gen‐
erated even if the user’s current shell is not /bin/sh.

-v This causes resize to print a version number to the standard
output, and then exit.

Note that the Sun console escape sequences are recognized by XFree86
xterm and by dtterm. The resize program may be installed as sunsize,
which causes makes it assume the -s option.

The rows and columns arguments must appear last; though they are nor‐
mally associated with the -s option, they are parsed separately.

/etc/termcap for the base termcap entry to modify.

~/.cshrc user’s alias for the command.

SHELL Resize determines the user’s current shell by first
checking if $SHELL is set, and using that. Otherwise it
determines the user’s shell by looking in the password
file (/etc/passwd). Generally Bourne-shell variants
(including ksh) do not modify $SHELL, so it is possible
for resize to be confused if one runs resize from a
Bourne shell spawned from a C shell.

TERM Resize sets this to “xterm” if not already set.

TERMCAP Resize sets this variable on systems using termcap,
e.g., when resize is linked with the termcap library
rather than a terminfo library. The latter does not
provide the complete text for a termcap entry.

COLUMNS, LINES Resize sets these variables on systems using terminfo.
Many applications (including the curses library) use
those variables when set to override their screensize.


csh, stty, tset

Mark Vandevoorde (MIT-Athena), Edward Moy (Berkeley)
Thomas Dickey (
Copyright (c) 1984, 1985 by X Consortium
See X(7) for a complete copyright notice.

Patch #322 2016-01-02 RESIZE(1)