SCP command

-P port parameter immediately port parameters, no spaces, the latter two for the file path, the copy direction from front to back, does not distinguish between local and remote paths

Distal path format: user name @ address: Remote Path

chestnut:

scp -P22000 ./clearLog.sh [email protected]:/root/taskBash

SELinux

ps -l displays the foreground program is being executed

Tips: When executing the command, the command & tail added later stage will be the implementation of the form

Background commands, handover management

ctrl + z foreground operation instruction can be used in the current ctrl + z pause instruction to the background
fg n ctrl + z will be placed back-to-back wakeup foreground continue, number n appear is suspended
bg n will suspend instruction form continues to run after the table, n is the number of pause time

Offline run the program nohup

The use of nohup command nohup does not support the bash built-in command , so please use shellScript script execution, chestnuts

# & 后台运行
nohup ./test.bash &

After the execution, it will output the prompt, press Return to return to the front desk, check-out operation will not interrupt instruction is executed

Process Management

top: process information dynamically view, similar to win the following task manager into the memory shift + e can switch display units
ps: the process list displays information
pstree: View the current process tree

[root@www ~]# ps aux <==观察系统所有癿程序数据
[root@www ~]# ps -lA <==也是能够观察所有系统癿数据
[root@www ~]# ps axjf <==连同部分程序树状忞

ps parameters:

A: All Qie process are displayed, no -e have the same Qiedian use;
a: For Qie Ji not all Process terminal;
u: active users (effective user) associated Qie Process;
x: a generally used with this parameter, more complete information can be listed.
Output format YingYing plan:
l: longer, more detailed Shen Qie the listed information PID Qieqie;
j: Work Qie format (jobs format)
f: to make a more complete output

Use top: -dn refresh interval in real time, in seconds, key definition after the start of the following instruction, instruction parameters not

P: displays are needed as a CPU resource ordering;
M: Memory are needed as to display resource ordering;
shift + e reality switch storage unit
1: All concrete core CPU occupancy
q: quit

pstree parameters:

A: each of the program tree Fu Qie connection between the connection to ASCII characters;
U: each program between tree Fu Qie Qie connection to Unicode characters to connect. In some terminal interfaces may be
wrong;
p: Jian Qie also lists the PID of each process;
u: Jian also listed for each process Qie your account name.

The process of killing

kill -signal PID
kill -9 pid/（%jobNumber）如果要管理jobs中的线程，需加上%
kill -l # 显示各类终止信号signal值与名称

kill command can be passed to different processes messages, perform different actions, commonly used are:

1: Re Qie Connaught take a parameter configuration file (reload the like);
2: representative of the keyboard input help [ctrl] -c same as Mai Qie;
9: immediately force the removal of a work;
15: Qie normal procedures terminate one are working. -9 Ji Qie not the same.
17: Pause, with ctrl + z

Instruction CPU priority

n: root values: -20-19, the general user 0-19, the lower the value, the higher the priority

nice [-n 数字] command

RAM

free -k / m / g kb / mb / gb memory information is displayed

Linux System Services

Related Category

table of Contents
/etc/init.d/*
/etc/sysconfig/*
/etc/*
/ Var / lib / *
/ Var / run / *
/etc/init.d/syslog/*

service instructions

service [service name] (start|stop|restart|...)

View status:

service --status-all

Tips: Centos has been replaced in 7+ be basically the same as systemctl manage usage

scp & Process Management & Service