With commands such as bg fg jobs, we can do something about jobs in the background.

&

Keep a command running in the background of the current session:

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vi &

bg

Wake up the paused background processes in the current environment and continue running.

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bg

fg

Moves a background process from the current environment to the foreground.

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fg

jobs

Show the status of the background jobs in the current session.

Here are some options for jobs command:

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vi &
jobs -l
jobs -p

nohup

Prepare an infinite loop script:

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printf '%s\n' \
'#!/bin/bash' \
'while true; do' \
'echo "a"' > script.sh
echo 'done' >> script.sh

Keep the script running in the background, even if the user logs out of the system, the running state of the command will not be terminated.

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# echo endless a characters to script.out file
nohup sh script.sh > script.out &
ll script.out
ll script.out
ll script.out
ll script.out
ll script.out

Check for running jobs’ process IDs:

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jobs -l

Kill the running process:

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kill 9802

Double check the jobs:

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jobs -l

References 7.2 Job Control Builtins, BG(1P), FG(1P), NOHUP(1), JOBS(1P)

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