A, linux third class
1. Common work order system
echo command
The output information to the screen
ech0 $PATH
date command
View and set the system time
date "+% Y-% m-% d" "+% H:% M:% S" (Note that case, input)
reboot command
poweroff command
wget command
wget http://www.baidu.com/haha.rar command format for downloading Internet files
ps command
R: running processes
S: sleeping processes, waiting for the user to provide services
D: Response Timeout
Z: zombie process zombie (usually appears there is a problem)
T: stop the process
ps -aux (can be written as ps aux) command displays all process information
top command
For dynamic monitoring of active processes
pidof command
PID pidof sshd process View
The kill command
kill 2156 terminate a specified process
killall httpd terminate all processes
ifconfig command
uname command
uname -a view system kernel information
cat /etc/redhat-release
uptime command
To view the system load information
Load value can not exceed 5.
free command
free -h users to view memory information system
who command
View user's current login host
last command
To view the system login records
history command
Check for command executed for the history -c Clear history! + Number Repeat command
Preparation command to save .bash_history cat ~ / .bash_history
sosreport command
sosreport for configuration and diagnostic information collection architecture
2. Change the working directory command
pwd command
Used to display the current directory
cd command
cd directory Example: cd / home directory for switching
cd - to return to the previous directory
cd ~ return home (Home) Contents
cd .. a a return to the root directory
ls command
ls -a linux in the beginning with the point of hidden files ls -l file details ls -al