Linux basic commands

First, Ptree: View the file directory hierarchy

Second, pgrep process name: can view process ID

Third, Chkconfig--list: Check the service open status; Chkconfig--list |grep process Name: view the specified process;

Chkconfig--level 2345 sshd on/OFF: Switch service at a specified level;

Iv. Ps-aux: View all process status: Z: Represents the zombie process;

V. Crontab-l: View timed Tasks; Crontab-e: Edit timed tasks;

Scheduled task format: Every Saturday 2:50 Execution (*: daily, monthly;/2: Every two days; 1,3,5: Weekly 1,3,5,;1-5: Monday to Friday)

Score of	When	Day	Month	Week	Day	Week
50	2	*	*	6	/2	1,3,5 1-5

Vi. grep-v "^#" |grep-v "^$"/etc/inittab: Filter out # Start and empty lines and view files

Linux basic commands