Six commands allowed from the command line if you have "limited capability" in
your user profile.
dspjoblog
dspjob
sndmsg
dspmsg
strpco
signoff
No other command is allowed by default.
To limit a user's capability, type chgusrprf (userprofilename) and press F4 and on the first screen at the bottom, there is an option for Limit Capability to either *yes or *no.