shl(1)							      General Commands Manual							    shl(1)

NAME

       shl - shell layer manager

SYNOPSIS

DESCRIPTION

       provides  a  means for interacting with more than one shell from a single terminal by using shell layers.  A layer is a shell that is bound
       to a virtual device.  The virtual device can be manipulated like an actual terminal by using and (see stty(1) and  ioctl(2)).   Each  layer
       has its own process group ID.  The user controls these layers by using the commands described below.

       The  current  layer  is the layer that can receive input from the keyboard.  Other layers attempting to read from the keyboard are blocked.
       Output from multiple layers is multiplexed onto the terminal.  To block the output of a layer when it is not current, the option can be set
       within the layer.

       The character (set to if NUL) is used to switch control to from a layer.  has its own prompt, to distinguish it from a layer.

   Definitions
       A  is  a  sequence  of characters delimited by a space, tab, or new-line character.  Only the first eight characters are significant.  When
       provided as an argument to the or commands, name cannot be of the form n or where n is a decimal number.

   Commands
       The following commands can be issued from the prompt level.  Any unique prefix is accepted.

       Create a layer called
		      name and make it the current layer.  If no argument is given, a layer is created with a name of the form where n is the num-
		      ber of the next available slot in an internal table.  Future references to this layer can be made with or without the paren-
		      theses.  If name is followed by a command, that command is executed in the layer instead of a shell.  If is the first  argu-
		      ment,  a	``login  shell'' is created in the layer.  The shell prompt variable is set to the name of the layer followed by a
		      space.

       Rename the layer
		      oldname, calling it newname.  If oldname is not specified, the current layer name is changed.

       Invoke a sub-shell and execute
		      command.	If no command is given, a shell is executed according to the environment variable.

       For each       name, block the output of the corresponding layer when it is not the current layer.   This  is  equivalent  to  setting  the
		      option within the layer.

       For each       name, delete the corresponding layer.  All processes in the process group of the layer are sent the signal (see signal(5)).

       Print the syntax of the
		      commands.

       For each       name,  list  the	layer  name  and its process group.  The option produces a ps(1)-like listing.	If no arguments are given,
		      information is presented for all existing layers.

       Change the status of the layer referred to by
		      name to that of current layer.  If no argument is given, the last existing current layer is changed.

       Change the status of the previous current layer
		      to that of current layer.

       For each       name, do not block the output of the corresponding layer when it is not the current layer.  This is  equivalent  to  setting
		      the option within the layer.

       Exit	      All layers are sent the signal.

       name	      Change the status of the layer referred to by name to that of current layer.  Any unique prefix is accepted.

WARNINGS

   Commands
       The  behavior of the and commands is not guaranteed when the SHELL environment variable is set to (for csh(1)) or (for ksh(1)), or when the
       shell saves and restores the tty state (defined in termio(7)) before and after each command is invoked interactively from that shell.   For
       both and the or options of can be used from within the layer to block or unblock the output of that layer.

   Ptydaemon
       For  to	function  properly,  the process must be running on the system.  If your system has been installed with the Desktop HP-UX product,
       then will not be started by default. In order to start this daemon, change from a "0" to a "1" in the file.   The  system  must	either	be
       rebooted for this change to take effect, or you can manually start this daemon by typing :

       Note  that  will  also be disabled if the DesktopConfig.LITECONFIG fileset has been installed on the system, or if the system administrator
       has previously run the utility and selected the from within any of screens.

       does not support long user and group names on the current release, HP-UX 11i V3.

FILES

       Variable containing path name of the shell to use (default is

SEE ALSO

       sh(1), stty(1), ioctl(2), signal(5).

STANDARDS CONFORMANCE

																	    shl(1)