kill & pkill & killall

Question 1

kill

Answer 1

Send the processes identified by PID or JOBSPEC the signal named by SIGSPEC or SIGNUM. If neither SIGSPEC nor SIGNUM is present, then SIGTERM is assumed.

Question 2

kill

<pid></pid>

• <signal></signal>
• s <signal></signal>

–signal <signal></signal>

Answer 2

<pid>, Send a signal to every <pid> listed.</pid></pid>

• <signal></signal>
• s <signal></signal>

–signal <signal></signal>

Specify the signal to be send. The signal can be specified using a nam of number.

Question 3

kill

• l
• L

Answer 3

• l, –list [signal], List signal names. This option has an optional argument, which will convert signal number to signal name, or other way round.
• L, –table, List signal names in a nice table.

Question 4

Signals

1

2

3

4

5

Answer 4

1) SIGHUP
2) SIGINT
3) SIGQUIT
4) SIGILL
5) SIGTRAP

Question 5

Signals

6

7

8

9

10

Answer 5

6) SIGABRT
7) SIGBUS
8) SIGFPE
9) SIGKILL
10) SIGUSR1

Question 6

Signals

11

12

13

14

15

Answer 6

11) SIGSEGV
12) SIGUSR2
13) SIGPIPE
14) SIGLARM
15) SIGTERM

Question 7

pkill

Answer 7

pkill looks through the currently running processes and will send the specified signal (by default SIGTERM) to each process that matches the criteria.

Question 8

pkill

• e
• c
• f
• g
• G
• i

Answer 8

• e, –echo, Display what is killed.
• c, –count, Count of matching processes.
• f, –full, Use full process name to match.
• g, –pgroup <pgid>, Match listed process group IDs.</pgid>
• G, –group <gid>, Match real group IDs</gid>
• i, –ignore-case, Match case insensitively.

Question 9

pkill

• n
• o
• P
• s
• t
• u

Answer 9

• n, –newest, Select most recently started.
• o, –oldest, Select least recently started.
• P, –parent <ppid>, Match only child processes of the given parent.</ppid>
• s, –session <sid>, Match session IDs</sid>
• t, –terminal <tty>, Match by controlling terminal.</tty>
• u, –euid <id>, Match by effective IDs</id>

Question 10

pkill

• U
• x
• F
• L

–ns <pid></pid>

–nslist <ns></ns>

Answer 10

• U, –uid <id>, Match by real IDs.</id>
• x, –exact, Match exactly with the command name.
• F, –pidfile <file>, Read PIDs from file.</file>
• L, –logpidfile, Fail if PID file is not locked.

–ns <pid>, Match the processes that belong to the same namespace as <pid></pid></pid>

–nslist <ns>, List which namespaces will be considered for the --ns option. Available namespaces: ipc, mnt, net, pid, user, uts.</ns>

Question 11

killall

Answer 11

killall sends a signal to all processes running any of the specified commands. If no signal name is specified, SIGTERM is sent.

Question 12

killall

• e
• I
• g
• y
• o
• i
• l

Answer 12

• e, –exact
• I, –ignore-case
• g, –process-group
• y, –younger-than, Kill processes younger than TIME
• o, –older-than, kill processes older than TIME
• i, –interactive, Ask for confirmation before killing
• l, –list, List all known signal names

Question 13

killall

• q
• r
• s
• u
• v
• w
• n
• Z

Answer 13

• q, –quiet
• r, –regexp
• s, –signal SIGNAL
• u, –user USER, Kill only processes running as user.
• v, –verbose
• w, –wait, Wait for processes to die.
• n, –ns PIS, match processes that belong to the same namespace as PID.
• Z, –context REGEXP, Kill only processes haveing context.