Brief Analysis of linuxkill and killall commands

The kill application is used together with the ps or pgrep command [root @ localhost ~] # Psauxf | grephttpdroot49390.00.05160708pts/3 S + 13:100:00 \ _ grephttpdroot48300.11.324232102...
The kill application is used together with the ps or pgrep command [root @ localhost ~] # Ps auxf | grep httpdroot 4939 0.0 0.0 5160 708 pts/3 S + \ _ grep httpdroot 4830 0.1 1.3 24232 10272? Ss/usr/sbin/httpdapache 4833 0.0 0.6 24364? S \ _/usr/sbin/httpdapache 4834 0.0 0.6 24364 4928? S \ _/usr/sbin/httpdapache 4835 0.0 0.6 24364 4928? S \ _/usr/sbin/httpdapache 4836 0.0 0.6 24364 4928? S \ _/usr/sbin/httpdapache 4837 0.0 0.6 24364 4928? S \ _/usr/sbin/httpdapache 4838 0.0 0.6 24364 4928? S \ _/usr/sbin/httpdapache 4839 0.0 0.6 24364 4928? S \ _/usr/sbin/httpdapache 4840 0.0 0.6 24364 4928? S 13:02 \ _/usr/sbin/httpd www.2cto.com we can view the httpd server process; you can also use pgrep-l httpd to view it; we can see the second column in the above example, is the process PID column, where 4830 is the parent process of the httpd server, and all processes from 4833-4840 are their 4830 sub-processes. if we kill the parent process 4830, the sub-processes under it will also die;
[Root @ localhost ~] # Kill 4840 note: kill the 4840 process. [root @ localhost ~] # Ps-auxf | grep httpd note: What are the results? Is the httpd server still running? [Root @ localhost ~] # Kill 4830 note: kill the httpd parent process. [root @ localhost ~] # Ps-aux | grep httpd note: Check whether other httpd sub-processes exist and whether the httpd server is still running? For zombie processes, kill-9 can be used to force termination and exit. for example, if a program has completely died, kill cannot exit without signal strength, the best solution is to add signal strength-9, followed by killing the parent process; for example, [root @ localhost ~] # Ps aux | grep gaimbeinan 5031 9.0 2.3 104996 17484? S gaimroot 5036 0.0 0.0 5160 724 pts/3 S + grep gaim or www.2cto.com [root @ localhost ~] # Pgrep-l gaim5031 gaim [root @ localhost ~] # Kill-9 5031
2 killallkillall directly kills all processes by program name. Usage: killall is a running program name. killall is also used with ps or pgrep for convenience. you can use ps or pgrep to check which programs are running. for example: [root @ localhost beinan] # pgrep-l gaim2979 gaim [root @ localhost beinan] # imaginecup by killall gaim author