jobs builtin to see what's running, or
top to see the most active processes on the system.
1$ find ~ -name \*.c >c-files & [1] 30384 2$ make -C pub >make.log 2>&1 & [2] 30385 3$ jobs [1]- 30384 Running find ~ -name \*.c >c-files & [2]+ 30385 Running make -C pub >make.log 2>&1 &
Jobs can be referred to by their process id (30384 and 30385), or by their job number (%1 and %2). (Job numbers are known only by the parent shell, but process ids are system-wide.)
Foreground jobs may be interrupted with C-z. That job may be placed in
the background by typing bg. The job will halt when it requests
input or displays output (unless it has been redirected). The job may
be killed with kill pid.
1$ find / -name \*bogus >|~/tmp/bogus-finds+ (C-z) [1]+ Stopped find / -name \*bogus >|~/tmp/bogus-finds 2$ bg [1]+ find / -name \*bogus >|~/tmp/bogus-finds & 3$ kill %1 [1]+ Terminated find / -name \*bogus >|~/tmp/bogus-finds