Info Catalog screen: Subprocess Execution screen: Using Exec

screen: Exec

 
 13.1 Exec
 =========
 
  -- Command: exec [[FDPAT] NEWCOMMAND [ARGS ... ]]
      (none)
      Run a unix subprocess (specified by an executable path NEWCOMMAND
      and its optional arguments) in the current window.  The flow of
      data between newcommands stdin/stdout/stderr, the process
      originally started (let us call it "application-process") and
      screen itself (window) is controlled by the file descriptor pattern
      FDPAT.  This pattern is basically a three character sequence
      representing stdin, stdout and stderr of newcommand.  A dot ('.')
      connects the file descriptor to screen.  An exclamation mark ('!')
      causes the file descriptor to be connected to the
      application-process.  A colon (':') combines both.
      User input will go to newcommand unless newcommand receives the
      application-process' output (FDPATs first character is '!' or ':')
      or a pipe symbol ('|') is added to the end of FDPAT.
      Invoking 'exec' without arguments shows name and arguments of the
      currently running subprocess in this window.  Only one subprocess
      can be running per window.
      When a subprocess is running the 'kill' command will affect it
      instead of the windows process.  Only one subprocess a time can be
      running in each window.
      Refer to the postscript file 'doc/fdpat.ps' for a confusing
      illustration of all 21 possible combinations.  Each drawing shows
      the digits 2, 1, 0 representing the three file descriptors of
      newcommand.  The box marked 'W' is usual pty that has the
      application-process on its slave side.  The box marked 'P' is the
      secondary pty that now has screen at its master side.
 

Info Catalog screen: Subprocess Execution screen: Using Exec