Linux simple commands

System environment configuration: setup killxxxx (pid): change the current character set encoding: vi/etc/sysconfig/i18n to LANG & quot; zh_CN.GB2312 & quot; current path: pwd packaging: tar-zcvfSMStatistic_old_20110505.tar.gzSMStatistic Unzip: tar.

System environment configuration:

Setup

Kill process:

Kill xxxx (pid)

 

Change the current character set encoding:

Vi/etc/sysconfig/i18n

Change to LANG = "zh_CN.GB2312"

 

Current path:

Pwd

 

Packaging:

Tar-zcvf SMStatistic_old_20110505.tar.gz SMStatistic

Decompress:

Tar-zxvf com_20110321.tar.gz

Unzip xxx.zip

View:

Ll view file date

Delete files and subdirectories:

Rw-rf sss

View IO count:

Ls0f-p

 

View the current system Port:

Netstat

 

Firewall settings:

1. add a trusted port

In Linux, the firewall is called iptables, and the configuration file is in/etc/sysconfig. I performed the following operations in sequence:

# Vi/etc/sysconfig/iptables

Add:

The following content is the program code

-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 80-j ACCEPT

-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 2222-j ACCEPT

2. disable and enable:

1) takes effect after restart

Enable: chkconfig iptables on

Close: chkconfig iptables off

2) takes effect immediately and becomes invalid after restart

Enable: service iptables start

Disable: service iptables stop

 

 

Configure Lan:

Ifconfig eth0 192.168.0.1 netmask 255.255.255.0

Restart IP address:

/Etc/init. d/network restart

 

Lan graphical configuration interface:

Netconfig

 

Assign permissions to the installation file:

Chmod + x postgresql-8.4.3-1-linux-x64.bin

/Postgresql-8.4.3-1-linux-x64.bin

List opened files:

Lsof-I: 5432

View the linux version:

Cat/etc/issue

View linux hardware parameters:

Uname-

Upload files:

Rz

Download file:

Sz

Move or rename:

Mv

Create a file:

Mkdir

 

Search for keywords in the vi file:

Enter "/", and then enter the "keyword" you are searching"

 

Linux uninstall built-in JDK 1.4.2 installation jdk-1_5_0_06-linux-i586.bin

1. display the existing Java version of Linux:

# Java-version

Java version "1.4.2"

Gcj (GCC) 3.4.5 20051201 (Red Hat 3.4.5-2)

Copyright (C) 2004 Free Software Foundation, Inc.

 

2, I downloaded the new version is: jdk-1_5_0_06-linux-i586.bin

 

3. # sh jdk-1_5_0_06-linux-i586.bin select yes as prompted (installation complete)

 

4. delete the original JDK:

1) # alternatives -- remove jar/usr/bin/fastjar

2) # alternatives -- remove jar.1.gz/usr/share/man/man1/fastjar.1.gz

 

5. delete the original link:

# Cd/usr/bin

# Rm-rf java

# Rm-rf javac

 

6. create a soft link java under/usr/bin:

# Cd/usr/bin

# Ln-s jdk1.5.0 _ 06/bin/java/usr/bin/java

# Ln-s jdk1.5.0 _ 06/bin/javac/usr/bin/javac

 

7. to facilitate subsequent work, two soft links are also established under/usr/lcoal.

# Cd/usr/local/

# Ln-s jdk1.5.0 _ 06/usr/local/jdk

# Ln-s jdk1.5.0 _ 06/jre // usr/local/jre

 

8. Compile Environment variables

# Cd/etc

# Vi profile

# Set Environment by NetSeek (2009/2/19)

JAVA_HOME =/usr/local/jdk

JRE_HOME =/usr/local/jre

PATH = $ PATH: $ JAVA_HOME/bin: JRE_HOME/bin

CLASSPATH =.: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar: $ JRE_HOME/lib:

Export JAVA_HOME JRE_HOME PATH CLASSPATH

 

9. make the environment variable take effect:

# Source/etc/profile

# Java-version

Java version "1.5.0 _ 06"

Java (TM) 2 Runtime Environment, Standard Edition (build 1.5.0 _ 06-b05)

Java HotSpot (TM) Client VM (build 1.5.0 _ 06-b05, mixed mode, sharing)

We can see that the Java version has changed to 1.5.0 _ 06.

 

Linux software startup Directory

/Etc/init. d/

/Etc/init. d/postgresql-8.4 restart

View the current linux environment

Env

Download gcc

Yum-y install gcc

 

Java virtual machine:

JAVA_HOME =/usr/local/jdk1.6.0 _ 17

PATH = $ JAVA_HOME/bin: $ PATH

CLASSPATH =.: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar

Export JAVA_HOME

Export PATH

Export CLASSPATH

Source/etc/profile

Find the file and delete it.

Find com/-name '*. class'-exec rm {}\;

View port number

Netstat-an | grep

View mocache

Lsof-I 44441

 

Tar cvzf fw.tar.gz mas_dongguanyinghang/-- exclude = "*. log *"