10-11-2017
The result of conflicting options depends on the ps version and should be documented in man ps.
The order of options should never matter, ps -ad is indentical with ps -da.
Please note that if you compare ps -e then ps -ed on an active system then it can differ because the number of processes have changed in between.
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killall(1M) killall(1M)
NAME
killall - kill all active processes
SYNOPSIS
[signal]
DESCRIPTION
is a procedure used by to kill all active processes not directly related to the shutdown procedure.
is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted. sends
the specified signal to all user processes in the system, with the following exceptions:
the process;
all processes (including background processes) associated with the terminal from which was invoked;
any process, if owned by
any process, if owned by
any process;
any process;
any process.
obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).
If no signal is specified, a default of (kill) is used.
is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).
FILES
SEE ALSO
fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).
STANDARDS CONFORMANCE
killall(1M)