The kill command in Linux is a powerful command to kill a process. You usually see the kill command accompanied by the process ID however there's other ways you can use the kill command. To get a list of how you can use the kill command, type kill -l
[root@cent7 jhuynh]# kill -l
1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP
6) SIGABRT 7) SIGBUS 8) SIGFPE 9) SIGKILL 10) SIGUSR1
11) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM
16) SIGSTKFLT 17) SIGCHLD 18) SIGCONT 19) SIGSTOP 20) SIGTSTP
21) SIGTTIN 22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ
26) SIGVTALRM 27) SIGPROF 28) SIGWINCH 29) SIGIO 30) SIGPWR
31) SIGSYS 34) SIGRTMIN 35) SIGRTMIN+1 36) SIGRTMIN+2 37) SIGRTMIN+3
38) SIGRTMIN+4 39) SIGRTMIN+5 40) SIGRTMIN+6 41) SIGRTMIN+7 42) SIGRTMIN+8
43) SIGRTMIN+9 44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-12
53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9 56) SIGRTMAX-8 57) SIGRTMAX-7
58) SIGRTMAX-6 59) SIGRTMAX-5 60) SIGRTMAX-4 61) SIGRTMAX-3 62) SIGRTMAX-2
63) SIGRTMAX-1 64) SIGRTMAX
There's one important thing that you have to remember as a standard user you can only kill are your own processes, so if you have two terminals open and one of them is not yours. You can only kill the processes in your terminal or session.
Let's say you run the command ps to see the processes that are running, all you need to kill a process is type kill -9 PID
[root@cent7 jhuynh]# ps
PID TTY TIME CMD
3526 pts/0 00:00:00 sudo
3541 pts/0 00:00:00 su
3544 pts/0 00:00:00 bash
4787 pts/0 00:00:00 ps
So it's something like this kill -9 3544 to kill the bash process this will kill the terminal, alternatively you can type out the word that corresponds to -9 with the command kill -sigkill 3544
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These command line are very useful to new era. In Linux, the kill command is a powerful command for eliminating a process. The kill command is commonly used in conjunction with the process ID, but it can also be used in other ways.
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