shlControl more than one shell (layer) from a single terminal.
From the shl prompt level, you can issue the commands listed below
(abbreviating them to any unique prefix if desired).
The name text string should not exceed eight characters.
See also layers.
name [name2...]Block the output for each layer name
(same as stty loblk).
name]Create the layer name (no more than seven total).
name [name2...]Delete the layer name.
Provide shl command syntax.
name...]Print information about layers. -l provides a ps-like display.
nameMake layer name be the current level.
Exit shl and kill all the layers.
name]Return to latest layer or to layer name.
Flip back to the previous layer.
name [name2...]Do not block output for each layer name
(same as stty -loblk).