====== backtick ======

===== Default Keybindings =====

None.

===== Syntax =====

  * ''**backtick** //id// //lifespan// //autorefresh// //cmd// //args...//''
  * ''**backtick** //id//''

===== Description =====

Program the backtick command with the numerical id //id//.  The output of
such a command is used for substitution of the ''%`'' [[man:String
Escapes|string escape]].  The specified //lifespan// is the number of
seconds the output is considered valid.  After this time, the command is
run again if a corresponding string escape is encountered.  The
//autorefresh// parameter triggers an automatic refresh for caption and
hardstatus strings after the specified number of seconds. Only the last
line of output is used for substitution.

If both the //lifespan// and the //autorefresh// parameters are zero, the
backtick program is expected to stay in the background and generate output
once in a while.  In this case, the command is executed right away and
''screen'' stores the last line of output.  If a new line gets printed,
''screen'' will automatically refresh the hardstatus or the captions.

The second form of the command deletes the backtick command with the
numerical id //id//.


===== Examples =====

    backtick 1 5 5 echo example
    caption always "this is an %1`"

===== See Also =====

  * [[man:String Escapes]]
  * [[:Misc]]