Quick Notes
cd /; sleep 1001 &
[1] 733 # shows job id and PID
cd /tmp; sleep 1002 &
[2] 1045 # shows job id and PID
cd /etc; sleep 1003
^Z # ctrl+Z sends job to background and stops it
[3]+Stopped sleep 1003
jobs # shows current jobs and statuses
[1] Running sleep 1001 & (wd: /)
[2]- Running sleep 1002 & (wd: /tmp)
[3]+ Running sleep 1003 &
[4] Done jobs
# the "+" indicates this is the last-used job
# When a job is running out of a different directory than the present-working-directory, the 'wd' (working directory) is shown in the jobs output to clarify what/where is being worked on.
pwd
/etc
fg # fg brings a job to the foreground (or %command)
# if no job id is given it uses the most recent job (marked with '+')
sleep 1003 # the command for that job is output when a job is brought to the foreground
^Z # ctrl+Z sends job to background and stops it
[3]+ Stopped sleep 1003
bg # bg tells a job to run in the background
# if no job id is given it uses the most recent job (marked with '+')
%3 # %# is the same as fg # - brings to foreground.
sleep 1003
wait %-; echo "Job done" # wait until the last job is completed, then echo "Job done"
See also the table here for more Identifiers notation/meaning (e.g., %N %-, etc)
