Linux

PWD and OldpwdThe PWD represents the current working directory, and the system automatically updates the environment variable after the directory is changedOldpwd represents the previous working directoryExperiment: Go to the/home directory, then CD

Vagrant IntroductionHere directly quoted the introduction of Baidu Encyclopedia ~ ^_^Vagrant is a ruby-based tool for creating and deploying virtualized development environments. It uses Oracle's Open source VirtualBox virtualization system to

The Run program installation package is essentially an installation script plus the program to be installed, as shown in:|-----------------|| || installation Script || ||-----------------|| || program || ||-----------------|figure: The structure of

What is Yum?Yum is the abbreviation for Yellowdog Updater modified. Yellowdog is a Linux distribution,rh that uses this upgrade technology to its own distribution to form the current yum, feeling that Yum and apt are similar in principle, but apt is

For multiple Linux servers, it is necessary to keep the time consistent. According to the accuracy requirements, there should be a corresponding time interval for time synchronization. If you do not synchronize time, long time will be very different,

There are shutdown, halt, reboot, and Init in the Linux Shimonoseki and reboot system, for whom their internal working process is different.1. Shutdown commandIt can be used to safely shut down the system, but when the system is shut down, all

2012-06-25 19:36:06 |   Category:   default category | report | font size subscription 1, download ffmpeg. wget http://down1.chinaunix.net/distfiles/ffmpeg-0.4.9-p20051120.tar.bz2I am on this website download ffmpeg-0.4.9-p20051120.tar.

You can use the command DF# Df/var/lib/filesystem 1k-blocks used Available use% mounted On/dev/sda3 135979984 66905292 62055896 52%/Not only see the size of the partition hanging at the point, also see.Plus-kh easier to

Crontab per minute, hourly, daily, weekly, monthly, yearlyExecute */5 every five minutes * * * *Executes 0 per hour * * * *Executes 0 0 * * * per dayWeekly Execution 0 0 * 0Monthly execution 0 0 1 * *Annual Execution 0 0 1 1 *Linux timed Execution

First modify the virtual machine parameters with VMware, increase the virtual machine disk space (refer to the relevant data), and then add the expanded disk space in the virtual machine.1. Use parted to view assignable space[Email protected] ~]#

The 1.description method is a nsobject approach, including class methods and Object methods//Default return class name //Default return 2. The class name and memory address are returned by default when using NSLog and%@ output objects3. Modify the

MySQLMySQL--host=127.0.0.1--port=3306--database=test--user=test--password=test--default-character-set=utf821. Script to find the same set of two filesTest1 Test21 22 33 4Cat Test1 Test2 | Sort | Uniq-d (Result:2 3)Cat Test1 Test2 | Sort | uniq-c |

The production of FHSWe know that there are many distributions of Linux at present, if the directory hierarchy of each distribution is different, then when the administrator to manage the other Linux hosts, it will not know much. And in the process

A few days ago, the rise wanted to play with HBase carefully, carefully to study, wrote a small demo, From Win7 to connect the hbase on another T510 Ubuntu. Very simple crud operation procedures, did not see what the problem, but run up, just like

find a lot of information, do not have windows to do time services, Linux synchronization Windows time, and finally found some software, finally took care of, write to share, so as to avoid many detoursFirst in

Previously we summarized the uptime and free commands. Today we will continue to summarize iostat. Leave a note for yourself and hope it will be useful to you. Version: Sysstat version 9.0.4(C) Sebastien Godard (sysstat orange. fr) Basic

User and User Group Management   Linux is a multi-user multi-task operating system. In a system, multiple users may be working at the same time. There are three main types of users in Linux: Root User: A super user with the highest permissions

Environment Sendmail is installed on the local machine, but it is not started. There is a mail server on other machines and the local machine has been added to the open relay list. You can send emails through this mail server.The procedure is as

Recently, a domestic Qilin system has been installed in the virtual machine. (I don't know about the Qilin system under Baidu .) **************************************** ********** Official Website:

Chapter II: Nonsense An interesting question: Use a macro to define "FIND" to FIND the amount of data transfer between a variable in a struct and struc, as shown in figure Struct student {int a; // FIND (struct student, a) equals 0 char B; // FIND