A '''[Terminal] Control Code''', AKA '''terminal escape sequence''', AKA
'''terminal control sequecence''', is an in-band sequence of bytes that may be
interpreted by a character imaging device such as a terminal.



** See Also **

   [Terminal]:   



** Reference **

   [http://www.ecma-international.org%|%ECMA]-[http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-048.pdf%|%48: Control Functions for Coded Character Sets:]:   

   [http://en.wikipedia.org/wiki/ANSI_escape_code%|%ANSI escape code], [http://wikipedia.org%|%Wikipedia]:   


   [http://www.termsys.demon.co.uk/vtansi.htm%|%ANSI/VT100 Terminal Control Escape Sequences]:   

   [http://invisible-island.net/xterm/ctlseqs/ctlseqs.html%|%XTerm Control Sequences], by Edward Moy, Stephen Gildea, and Thomas Dickey:   

   [http://sydney.edu.au/engineering/it/~tapted/ansi.html%|%ANSI Standard (X3.64) Control Sequences for Video Terminals and Peripherals in alphabetic order], by mnemonic:   



** Description **

The most common set of control codes, known as '''[ANSI] escape sequences''', and standardized in control set is 



** Example:  [ANSI] Sequences **

[AM] 2014-05-06: The other day someone asked about controlling the output on screen, so that the last line would be rewritten with new results. Here is a simple solution which works with these ANSI escape codes. Unfortunately you only get the proper effect on Linux terminals and other ANSI-enabled terminals. 
The code is, however, dead simple:

   * Move the cursor to the right position (\escape[[10;0f)
   * Clear everything at this position and below (\escape[[J)
   * Write the new output

======
# showcomp.tcl --
#     Small program to illustrate the use of ANSI sequences
#

while 1 {
    puts -nonewline "\x1b\[10;1f\x1b\[J"
    puts "Result: [clock seconds] - [expr {rand()}]"
    puts "Computing ..."
    after 1000
}
======



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