diff --git a/sources/tech/What Options you use for Linux killall Command -- I have 5 Options.md b/sources/tech/What Options you use for Linux killall Command -- I have 5 Options.md deleted file mode 100644 index 7862881e6c..0000000000 --- a/sources/tech/What Options you use for Linux killall Command -- I have 5 Options.md +++ /dev/null @@ -1,159 +0,0 @@ -intermerlin Translating - -What Options you use for Linux killall Command ? I have 5 Options -================================================================================ -Linux command line offers various commands to kill a process. For example, the ‘kill’ command can be used to kill a process by passing its PID as an argument, the ‘pkill’ command takes a pattern as an input and all the matching running processes are killed. But there exists a command ‘killall’, which exactly matches the argument name by default, and kills the matching process. In this article, we will discuss this command with some practical examples. - -![](http://linoxide.com/wp-content/uploads/2014/02/killall-command.jpg) - -### Linux killall Command ### - -The killall command can be used to send a signal to a particular process. The signal can be specified as an argument to this command or else SIGTERM is sent by default. - -Lets discuss the usage of this command through some practical examples. - -#### 1. A basic example #### - -In this example, we will show how killall command can be used to kill a particular process. Suppose, there are two processes that have same initial characters : - - $ ps -aef | grep “test” - himanshu 3969 2811 0 14:14 pts/0 00:00:00 ./test - himanshu 3970 2811 0 14:14 pts/0 00:00:00 ./test_again - -Now, here is how you can use the killall command to kill ‘test_again’ : - - $ killall test_again - [2]+ Terminated ./test_again - -As you can see, the ‘killall’ command terminated the ‘test_again’ process. This can also be confirmed through the ps command : - - $ ps -aef | grep “test” - himanshu 3969 2811 0 14:14 pts/0 00:00:00 ./test - -Observe that ‘test_again’ is not displayed in the output as it is killed. - -#### 2. Ignore case using -I option #### - -The killall command is case-sensitive by default. Here is an example : - - $ ps -aef | grep “test” - himanshu 4177 3161 0 14:54 pts/3 00:00:00 ./test - himanshu 4178 3161 0 14:54 pts/3 00:00:00 ./test_again - himanshu 4180 3161 0 14:54 pts/3 00:00:00 grep --color=auto test - - $ killall TEST - TEST: no process found - -So you can see that the killall command could not find any process named TEST, while a process named ‘test’ is already running. - -To make sure that the killall command ignores the case, use the -I option. Here is an example : - - $ killall -I TEST - [1]- Terminated ./test - -Observe that now it successfully terminated the ‘test’ process. - -#### 3. Kill processes interactively using -i option #### - -The killall command can be used to kill more than process. - - $ killall test test_again - [2]- Terminated ./test_again - [3]+ Terminated ./test - -But, if you want killall to terminate processes interactively, you can use the -i option. - -Here is an example : - - $ killall -i test test_again - Kill test(4201) ? (y/N) y - Kill test_again(4202) ? (y/N) y - [1]- Terminated ./test - [2]+ Terminated ./test_again - -So you can see that this way user can control the termination of processes using killall command. - -#### 4. Disable details if no processes were killed using -q option #### - -Sometimes when killall is not able to find a specified process, it complains about the same in the output. - -Here is an example : - - $ killall TEST - TEST: no process found - -But, in case you want killall to carry out its work quietly, you can use the -q option : - - $ killall -q TEST - $ - -So you can see that when -q was used, the output was suppressed. - -#### 5. List all the supported signals in output using -l option #### - -As already described in the beginning, killall sends signals to processes. You can use the -s option (followed by the signal name) to send a particular signal to a process. - -To know, what all signals this command can send, use the -l option. - - $ killall -l - HUP INT QUIT ILL TRAP ABRT IOT BUS FPE KILL USR1 SEGV USR2 PIPE ALRM TERM - STKFLT CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR SYS - UNUSED - -So killall supports all these signals. - -### Something to discuss ### - -The man page of the killall command says that by default, it matches complete names only if they are less than or equal to 15 characters in length. - -For example, suppose there are following two processes with long names : - - $ ps -aef | grep “test” - himanshu 4021 3161 0 14:27 pts/3 00:00:00 ./test_abcdefghij - himanshu 4035 3161 0 14:27 pts/3 00:00:00 ./test_abcdefgh - -The first process in the output above has exactly 15 characters in name. Lets try to kill it using the killall command : - - $ killall test_abcdefghij - [1]- Terminated ./test_abcdefghij - -So you can see that the killall command kills the process successfully. - -Now, according to the man page, if both the names would have had more than 15 matching characters, killall would have killed both the processes. Here is an example : - - $ ps -aef | grep “test” - himanshu 4114 3161 0 14:40 pts/3 00:00:00 ./test_abcdefghijklmnopqrstuvwx - himanshu 4141 3161 0 14:46 pts/3 00:00:00 ./test_abcdefghijklmnopqrstuvwxyz - himanshu 4143 3161 0 14:46 pts/3 00:00:00 grep --color=auto test - -Observe that both the processes now have more than 15 matching characters in their name. Now, when I tried to kill the second process using killall : - - $ killall test_abcdefghijklmnopqrstuvwxyz - [6]+ Terminated ./test_abcdefghijklmnopqrstuvwxyz - -It killed only the specified process, and not the other one. - - $ ps -aef | grep “test” - himanshu 4114 3161 0 14:40 pts/3 00:00:00 ./test_abcdefghijklmnopqrstuvwx - himanshu 4146 3161 0 14:47 pts/3 00:00:00 grep --color=auto test - -I am not sure if there is something incorrect on my side, or it is a bug in killall command. I’d appreciate if you put forward your views on this in comments. - -BTW, here are the details of killall command on my system : - - $ killall --version - killall (PSmisc) 22.20 - Copyright (C) 1993-2012 Werner Almesberger and Craig Small - - PSmisc comes with ABSOLUTELY NO WARRANTY. - This is free software, and you are welcome to redistribute it under - the terms of the GNU General Public License. - For more information about these matters, see the files named COPYING. - --------------------------------------------------------------------------------- - -via: http://linoxide.com/linux-command/linux-killall-my-options/ - -译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID) - -本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出