One: Control of processes and services
1. What is a process
Programs that are in progress in the system
2. How the graphics process is viewed
Gnome-system-monitor
3. View the commands for a process
PS Viewing process
A current process-related process (contains information about the current environment itself)
-a displays all processes in the current terminal (without the current environment itself information)
-A|-E System All Processes
x contains all processes containing the terminal (must contain a TTY (character output device))
F Viewing the dependencies of a process
Everyone of the U-process
PS ax-o comm,nice,%cpu,%mem,pid,user,group,stat View ...
PS Ax--sort=%cpu default to ascending order
PS Ax--sort=-%cpu Descending order
4. Priority of the process
-20 ———— 19
The smaller the number, the greater the priority.
Renice-n 5 2580
S Process State
s This process is a top-level process
The T process is temporarily stopped
High priority of the process
The ' empty ' process has a normal priority
N-Process Priority low
L process has lock space in memory
Renice-n-5 PID Specifies the priority of the modification process
Nice-n-5 Command & Assign priority to open a process
5. Calls to and from the process
CTRL + Z will occupy the terminal process into the background stop
Jobs View all processes temporarily suspended in the current background
BG Jobsnum to run the specified process in the background
FG Jobnum Returning the specified process to the foreground
CTRL + C will consume the current terminal's process end
6. Signal
1 reloading the configuration without stopping the process
2 Purging process in-memory data
3 clearing the mouse's in-memory data
9 forcibly ending a process
15 Normal shutdown process (blocking control of file permissions and control of processes and services)
18 Running a stopped process
19 Suspend process (cannot be blocked)
20 Pause process (can be blocked)
Kill Signal PID
Killall Signal Process Name
IP addr Show Br0 real machine query the IP address of this machine
Ifconfig eth0 Virtual Machine Query the IP address of this machine
7. Control of the service
Systemctl Start Sshd.service Open
Systemctl Stop Sshd.service Stops
Systemctl Status Sshd.service View status
Systemctl Retart sshd.service Restart
Systemctl Enable Sshd.service Boot
Systemctl list-units List Current system-enabled services
SYSTEMCTL list-unit-files list service boot status in the system
Systemctl Mask sshd
Systemctl unmask sshd
Systemctl
Level has 0-6, 0 is shutdown, 6 is reboot, 234 is
Control of Linux processes and services
