suspend

Suspends the execution of the shell.

Summary

suspend [-f]

The main purpose

• Suspend the execution of the shell until the SIGCONT signal is received.

• Cannot be used with the login shell unless the -f option is used.

Options

-f performs a suspend operation on the login shell.

return value

Returns successful unless job control is not enabled or an error occurs.

example

# Open a terminal and first obtain the PID.
echo $$
# Execute the suspend command
suspend

# Open another terminal and send the SIGCONT command
kill -s SIGCONT PID
# At this point, the previous terminal ends the suspended state and can interact normally.

Notice

• The job control commands of bash include bg fg kill wait disown suspend.

• This command can only be executed when the set option monitor is turned on; to view the job control status: enter set -o to view the monitor line; execute set -o monitor or set -m to turn it on this option.

• This command is a built-in bash command. For related help information, please see the help command.