Linux

Sudo is a common tool that allows ordinary users to use Superuser privileges under Linux, allowing the system administrator to allow ordinary users to perform some or all of the root commands, such as HALT,REBOOT,SU, and so on. This will not only

The sort command's function is to sort the rows in a file. The sort command has a number of very useful options, which were initially used to sort through various sorts of file contents in a database format. In fact, the sort command can be

Linux crontab command, the minimum execution time is one minute. If you need to repeat in less than one minute, there are two ways to implement it. 1. Use delay to implement every n seconds Create a PHP to do the action, very simple, is to write

Information for the file to be set: v0id6@v0id6-eof ~ $ ls Testacl-la -rw-rw-r--+ 1 v0id6 v0id6 9 March 2 14:21 testacl Gets the access control list for the file (this is the value before the SETFACL setting is used) v0id6@v0id6-eof ~ $ getfacl

1, problem performance2, the cause of the problem3, Problem solving4, test ideas5, blog Record1, problem performanceSSH login   problem performance: [Email protected]:~$ ssh [email protected]openssh_6.6.1, openssl

Failure Phenomena : Use Telnet ip+ port to test normal, can access; via Telnet domain + port mode, hint: unknown name or service (name or services not known). Test Baidu's network address, Ping can pass. But ping the domain name,

How Linux tests IO performance (disk read/write speed)These days to do the MySQL performance test, a huge company, find a few performance testing machines are very tangled, finally coordinated to two, IO performance is not known.The database is an

the best use of the history of the free turn Qiang weaponIntroductionAwk is a powerful text analysis tool, with the search for grep and the editing of SED, which is especially powerful when it comes to analyzing data and generating reports. To put

(1) Configuring the kernelHow to configure the kernel1. Make config text-based interactive configuration2. Make Menuconfig menu-based configuration in text modeConfiguring the kernel with make MenuconfigIn the configuration <>,[]<> can be used in

1 command functions The alias command is used to set an alias for an instruction, and aliases set by the alias command are limited to the login operation, and an alias can be set in/etc/profile or in your own ~/.BASHRC if you want to automatically

IPC Three communication mechanism refers to: semaphore, shared memory, message queue, signal Volume: Through the operating system of the PV operation to achieve;Shared Memory: Request a piece of memory, process A to write in shared memory, other

Under Liunx is originally not support RAR file, need to install Liunx under the WinRAR version, operation as followswget http://www.rarsoft.com/rar/rarlinux-4.0.1.tar.gz-zxvf rarlinux-4.0. 1 . TAR.GZCD rar Make########################################

1. Installing Erlang dependenciesYum install-y gcc gcc-c++ unixodbc-devel openssl-devel ncurses-devel2. Installing Erlang# # # Set Installation location./configure--prefix=/opt/apps/erlang--without-javac# # InstallationMake && make install# # # Add

Cat: Connect and display filesNAMEcat-concatenate files and print on the standard output[Email protected] ~]# cat/etc/issueRed Hat Enterprise Server Release 6.6 (Santiago)\m[Email protected] ~]# Cat/etc/fstab##/etc/fstab# Created by Anaconda on Sun

A Linux operating system-based server runs at the same time, it will also characterize a variety of parameter information. In general, OPS and system administrators are extremely sensitive to these data, but these parameters are also important to

IntroductionLsof (list open files) is a tool that lists open files for the current system. In a Linux environment, everything is in the form of files, with files that not only access regular data, but also access to network connectivity and hardware.

Original Technology Achievement Dream Link: http://ixdba.blog.51cto.com/2895551/541355A physical memory and virtual memory         We know that reading and writing data directly from physical memory is much faster than reading and writing data from

Remi Repository is a Linux source that contains the latest versions of PHP and MySQL packages.1. Enterprise Linux7(with EPEL) X86_64wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpmwget

Last command : used to list information about users who are currently logged in to the system in the past. The information is saved in the/var/log/btmp file. You can do this by:# True >/var/log/wtmpTo clear the record.lastb Command :Function

Crontab scheduled task instance and crontab task instance Instance 1: Execute myCommand once every minute * *** MyCommand Instance 2: 3rd and 15th minutes per hour 3, 15 * myCommand Instance 3: Run at 3rd and 15th minutes from eight o'clock A.M. 3, 1