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Display bash built-in help

$ help # show bash built-in help.

Execute commands in foreground and background

$ path/to/program # execute a command in foreground

$ path/to/program & # Execute a command in background

Suspend a command that runs in foreground:
C-z

List current jobs

$ jobs
[1]- Running dev_appserver.py my_app & (wd: ~/devel)
[2]- Running ( while true; do date; sleep 5; done )
[3]+ Stopped sleep 300

It lists three jobs.

Make a job run in foreground

$ fb %1 # %1 is a job spec.

Make a job run in background

$ bg %2

Kill a job

$ kill %1 # %1 is a job spec.

E.g:
$ kill %2
$ jobs
[1]- Running dev_appserver.py my_app & (wd: ~/devel)
[2]+ Terminated ( while true; do date; sleep 5; done )

Wait for background jobs to finish

$ wait # wait for all background jobs to finish.

$ wait %2 # wait for job number 2 to finish

REFERENCE

Advanced Bash-Scripting Guide: Job Control Commands