fish-shell/sphinx_doc_src/cmds/suspend.rst

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suspend - suspend the current shell
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Synopsis
--------
suspend [--force]
Description
------------
``suspend`` suspends execution of the current shell by sending it a
SIGTSTP signal, returning to the controlling process. It can be
resumed later by sending it a SIGCONT. In order to prevent suspending
a shell that doesn't have a controlling process, it will not suspend
the shell if it is a login shell. This requirement is bypassed
if the ``--force`` option is given or the shell is not interactive.