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| Chapter 2 UNIX Commands |

## shl

    shl

Control 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.

block `name` [`name2...`]

  Block the output for each layer `name` (same as stty loblk).

create [`name`]

  Create the layer `name` (no more than seven total).

delete `name` [`name2...`]

  Delete the layer `name`.

help or ?

  Provide shl command syntax.

layers [-l] [`name...`]

  Print information about layers. -l provides a ps-like display.

`name`

  Make layer `name` be the current level.

quit

  Exit shl and kill all the layers.

resume [`name`]

  Return to latest layer or to layer `name`.

toggle

  Flip back to the previous layer.

unblock `name` [`name2...`]

  Do not block output for each layer `name` (same as stty -loblk).

Reference: sh |  | Reference: shutdown