-e

Require an exact match for very long names. If a command name is longer than 15 characters, the full name may be unavailable(i.e. it is swapped out). In this case, killall will kill everything that matches within the first 15 characters. With -e,such entries are skipped. killall prints a message for each skipped entry if -v is specified in addition to -e,

-I

Do case insensitive process name match.

-g

Kill the process group to which the process belongs. The kill signal is only sent once per group, even if multiple processesbelonging to the same process group were found.

-i

Interactively ask for confirmation before killing.

-l

List all known signal names.

-n

Match against the PID namespace of the given PID. Use 0 to match against all namespaces. The default is to match against thecurrent PID namespace.

-o

Match only processes that are older (started before) the time specified. The time is specified as a float then a unit. Theunits are s,m,h,d,w,M,y for seconds, minutes, hours, days, weeks, Months and years respectively.

-q

Do not complain if no processes were killed.

-r

Interpret process name pattern as a POSIX extended regular expression, per regex(3).

-s

Send this signal instead of SIGTERM.

-u

Kill only processes the specified user owns. Command names are optional.

-v

Report if the signal was successfully sent.

-V

Display version information.

-w

Wait for all killed processes to die. killall checks once per second if any of the killed processes still exist and onlyreturns if none are left. Note that killall may wait forever if the signal was ignored, had no effect, or if the processstays in zombie state.

-y

Match only processes that are younger (started after) the time specified. The time is specified as a float then a unit. Theunits are s,m,h,d,w,M,y for seconds, minutes, hours, days, weeks, Months and years respectively.

-Z

(SELinux Only) Specify security context: kill only processes having security context that match with given extended regularexpression pattern. Must precede other arguments on the command line. Command names are optional.FILES/proc location of the proc file systemKNOWN BUGSKilling by file only works for executables that are kept open during execution, i.e. impure executables can't be killed this way.Be warned that typing killall name may not have the desired effect on non-Linux systems, especially when done by a privileged user.killall -w doesn't detect if a process disappears and is replaced by a new process with the same PID between scans.If processes change their name, killall may not be able to match them correctly.killall has a limit of names that can be specified on the command line. This figure is the size of an unsigned long multiplied by 8.For most 32 bit systems the limit is 32 and similarly for a 64 bit system the limit is usually 64.