[Linux] Common commands __linux

1. Find the process

Command: Ps-ef |grep < find content >

such as: Etl-fw:[/ytxt/jboss/server/default/deploy] $ps-ef |grep java
Jyfx 6119 55252 0 11:33 pts/0 00:00:00 grep java
Jyfx 15300 1 0 Aug07? 00:00:00/bin/sh./run.sh

2. Shutdown process

Command: kill-9 < process number >

such as: Kill-9 15300

3, modify the file or directory of the user

Basic Syntax:Chown [-r] Account name file or directory Chown [-r] Account name: User group name file or directoryParameters:-r: Continuous changes to recursive (recursive), that is, all files and directories under the subdirectory are updated to this user group. Often used when changing a directory.Example 1: [Root@localhost home]# touch testfile//create file by root user [root@localhost home]# ls testfile–l-rw--w--w-1 root ro OT 0 June 7 19:35 testfile//File owner and owner level are root [root@localhost home]# chown Yangzongde testfile//modify file owner for Yangzongd e [root@localhost home]# ls testfile-l-rw--w--w-1 yangzongde root 0 June 7 19:35 testfile//view file owner as Yangzongde, but group is still root
4, modify the file or directory of the user group basic syntax: CHGRP [r] User group name Dirname/filename ...Parameters:-r: Continuous changes to recursive (recursive), that is, all files and directories under the subdirectory are updated to this user group. Often used when changing a directory.Example 3[root@localhost home]# ls testfile-l-rw--w--w-1 yangzongde root 0 June 7 19:35 testfile//view file owner is Yangzongde, but group is R  oot [root@localhost home]# chgrp yangzongde testfile//Modify owner Group Yangzongde [root@localhost home]# ls testfile-l -rw--w--w-1 Yangzongde Yangzongde 0 June 7 19:35 testfile [root@localhost home]# chown root:root testfile//Use Cho WN one-time modification owner and group [root@localhost home]# ls testfile-l-rw--w--w-1 root root 0 June 7 19:35 testfileExample 4[Root@linux ~]# chgrp users Install.log [root@linux ~]# ls-l-rw-r--r--1 root users 68495 June 08:53 Install.logExample 5Change to a user group that does not exist in a/etc/group [root@linux ~]# chgrp testing install.log group name ' chgrp:invalid ' testing error message ~ I can't find this user group name ~