Common Linux commands required by programmers

This article by larrylgq prepared, reproduced please note the Source: http://blog.csdn.net/larrylgq/article/details/7395261
Author: Lu guiqiang
Email: larry.lv.word@gmail.com

Upper: http://blog.csdn.net/larrylgq/article/details/7333632

Frequently-needed dependencies for newly installed Ubuntu Software

Sudo apt-get-F install libcryct-perl libgnome2-gconf-perl Libnet-proxy-perl libyaml-perl libcrypt-CBC-perl libcrypt-Rijndael-perl libio-stty-perl libcrypt-blowfish-perl libgtk2-gladexml-perl libgtk2-ex-simple-list-perl Libnet-ARP-perl libossp-UUID-perl
Libossp-uuid16

Disable SELinux

Modify SELinux = disabled in the/etc/SELinux/config file, and then restart the server.

Setenforce 1 sets SELinux to enforcing Mode

Setenforce 0 sets SELinux to permissive Mode

Disable Firewall

/Etc/init. d/iptables stop

DF-H

View hard disk Information

View System bits in Ubuntu

Uname-

Ubuntu allows you to view the number of digits supported by the machine.

Lshw

PS-Aux | grep Tomcat

View the port occupied by the program

Netstat
-APN | grep 8080

View the program using the port

Whereis MySQL

Find the installation directory of MySQL

Which MySQL
Find the MySQL running directory

VI ~ /. Add alias idea = "CD ~ to bashrc ~ /Idea117/bin; nohup./idea. Sh &"
Alias idea

Quick Start

[Root @ admaster ~] # Vi/etc/sysconfig/Network
Hostname = yourname
[Root @ admaster ~] # Vi/etc/hosts
127.0.0.1 localhost. localdomain localhost
172.17.33.169 yourname // modify the hostname here
[Root @ admaster ~] # Hostname supervisor2
[Root @ admaster ~] # Su
[Root @ supervisor2 ~] #

Modify the Linux host name and take effect immediately

VI/etc/profile

# System variable directory

: | Dd OF = fname seek = 1 bs =$ ($ (stat-C % s fname)-$ (tail-2 fname | WC-C )))
Delete the last few lines of oversized text

Hadoop jar panel. Jar refer-D mapred. Child. java. opts =-xmx2048m cookie View

# Modify JVM memory during hadoop Runtime

Java-jar ad4rmi. Jar 1> logad4mr. log 2> & 1

1: Standard output, 2: Error output

MV-f/home/admaster/ad4mr/*/home/hadoop/ad4mr

Copy an object

Nohup Java-Jar/home/hadoop/rmiserver/RMI. Jar &

Run your program in the background

PS aux | grep jar
Search for processes

More ~ User/. bash_history

View the historical commands of a user, but you only need the access permission.

SCP-p58404 usr@xx.xxx.xxx.XXX:/home/usr/ad4mr/*/home/hadoop/xxx

Copy files between machines

Cat www.csdn.net. SQL | grep LV

File Search

Mount-o rw xx. XXX:/data/report/data/Report

Hard Disk ing

Distinct

File deduplication

Chown

Change file user

Chmod-r 777 help.txt

Modify file permissions

Ln help.txt OK

Create shortcuts

Tail-N 24
View the last 24 lines of Files

Screen-s tagfreq // open a screen
CTRL + A and then press d

Screen-r 22879 // enter an opened Screen

Exit

Screen usage:

CAT/data/report/dist_c1606_m5/dist_.csv | awk-F, '{printf $1 ",-1, "$2" \ n "} '>/data/report/pool/1606.csv
Screen
Awk '{print ($1> 4? "High" $1: "low" $1)} 'file

Awk replaces the file content and formatting the output

Crontab-e
20 6 ***/bin/bash/home/test/10079.sh

Scheduled call

Http://example.com/really-big-file.iso wget-C

Download-c Indicates resumable upload.

Rm-RF

Recursively delete folders

Add Group

Addgroup hadoop

Add a user to a group

Adduser -- ingroup hadoop Larry

Add existing users to a group
Usermod-G hadoop Larry

Sudo passwd root #

Set Root Password

Su-

Export do-F/etc/sudoers

You can use sudo

Sudo apt-Get install Nautilus-open-terminal #

Right-click Terminal plug-in

Run the command $ groups user to view the group to which the user belongs.

Or view the file: $ CAT/etc/group.

To install a. Deb File

Sudo dpkg-I package_file.deb

To uninstall A. Deb File
Sudo dpkg-r package_name

Sudo apt-Get autoremove
Sudo apt-Get autoclean
Sudo apt-Get update
Sudo apt-Get upgrade
Sudo apt-Get dist-Upgrade
Update System