resize - set environment and terminal settings to current xterm window size
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
      /etc/passwd.
- then it decides whether to use Bourne shell syntax or C-Shell syntax. It
      uses a built-in table of known shells, which can be overridden 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. Depending
      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 values shown
      by stty.
- finally, resize generates shell commands for setting the
      environment variables, and writes that 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 temporary 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 does not appear to use C shell syntax.
- -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 generated even
      if the user's current shell does not appear to use Bourne shell
    syntax.
- -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 normally 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
- Unless overridden by the -c option, resize determines the
      user's current shell by
  - first checking if $SHELL is set, and using that,
- otherwise resize looks 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.
- After determining the user's shell, resize checks the shell's name
      against a table of known shell names. If it does not find the name in its
      table, resize will use C shell syntax for the generated commands to
      set environment variables.
  - TERM
- Resize's generated shell command sets this to "vt100" if
      not already set.
- TERMCAP
- Resize's generated shell command 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's generated shell command sets these variables on systems
      using terminfo. Many applications (including the curses library) use those
      variables when set to override their screensize.
use_env(3x)
csh(1), stty(1), tset(1)
xterm(1)
Mark Vandevoorde (MIT-Athena), Edward Moy (Berkeley)
Thomas Dickey (invisible-island.net).
Copyright (c) 1984, 1985 by X Consortium
See X(7) for a complete copyright notice.