Linux

Precautions for installing CentOS 1. When selecting a partition scheme, select the last one: Custom partition policy. Partition policy: 1./boot partition 100M2, swap partition system memory x23, and remaining space allocated to/partition (root

First look at Linux File Permissions 1. Users and user groups in order to better understand file permissions, we need to first have the concepts of users and user groups. In Linux, any file has individual permissions for three identities: User,

Sed stream editor sed is a stream editor ). In sed, pattern space and hold space are two buffers. At the beginning, data is read from the standard input into pattern space and processed and output to the standard output. Hold space is only a buffer

Ubuntu 12.04 amule settings 1. download and install amule. You can find the amule software in the Software Center for installation or use apt-get to install it on the command line. 2. configure amule. set server address 1. you can use the emule

/Var/spool/clientmqueue analysis and massive file deletion processing many files exist in the/var/spool/clientmqueue directory of a server. The ls has to be executed for a long time and has been checked online, record: cause: some users in the

/Var/spool/clientmqueue is full. If a user cannot be added, "useradd: unable to lock password file" may occur. You cannot install useradd: unable to lock password file in the source program. baidu has introduced a passwd under the/etc/directory.

In Linux, add a hard disk to the Virtual Machine for logical volume creation and management, and view the hard disk status. Run the fdisk-l command: [root @ jerrybj ~] # Fdisk-l Disk/dev/sda: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 26

Linux/usr/bin/ld cannot find solves the problem: the following error message often appears when compiling the source code of an application or lib in linux:/usr/bin/ld: the cannot find-lxxx messages have different results as different source codes

AIX synchronizes the new LV in the image VG, and the Manual LV is already in the image VG, create a new LV. If no Number of COPIES of each logical partition 2 + is selected, the created LV has no image, when lsvg-l vgname is used, the new LV is One

[Linux] CentOS study note 2 (command) Open the folder: cd finename create directory: mkdir/filename mkdir-p/test/123/111 (Multi-Level directory) delete directory: rmdir is used to delete a directory or file: rm is used to find the absolute path of a

Common configuration of High-concurrency Linux Server fs. file-max = 999999 # maximum number of handles that a process can open at the same time. net. ipv4.tcp _ tw_reuse = 1 # reuse socketnet in TIME_WAIT status. ipv4.tcp _ keepalive_time = 600 #

Ubuntu12.04 Server configuration record 1. single NIC with Single IP (common) vi/etc/network/interface auto eth0 iface eth0 inet static address IP netmask subnet mask gateway open file/etc/network/interfaces, make sure that The Network Manager is

In debian exim4 configuration problems, the exim4 In Debian is configured to be in internet mode and can be sent to the internet, but cannot be sent to the mail server in the LAN. the/var/log/exim4/mainlog prompt is: ** xxx@nlpr.ia.ac.cn: all

Squid startup parameter 1. Add-z to the first startup to create the squid cache HASH directory and initialize it. The squid command line option-a port specifies the new http_port value. This option overwrites the value from squid. conf. However,

LINUX-awk command NF and $ NF differences LINUX-awk command NF and $ NF difference Q & A: 1. What does $ NF in awk mean? # Pwd/usr/local/etc ~ # Echo $ PWD | awk-F/'{print $ NF}' etc NF indicates the number of browsing records. $ NF indicates the

Use SSH $ RemoteNode to execute commands on a remote machine locally, for example, ssh user @ node ls/local will execute the ls/local command on the remote machine. If you want to execute multiple commands continuously on the remote machine, these

Git branch management Common commands view local branches [plain] git branch * dev master * represents the current dev branch to view remote branches [plain] git branch -- remote origin/dev origin/master to create branches [plain] git checkout-B new_

The SMTP server configured in sendmail is restricted by the company's intranet firewall. When GitLab sends an email to Gmail or another Internet mailbox via SendMail, the following error occurs: [plain] Jul 14 06:48:14 gitlab sm-mta [12379]:

Linux symbolic link and hard link have file A. Now you need to create A new link to this file. You can choose symbolic link and hard link. The symbolic link is used to create A new file. The block of the new file stores the inode and the file name

Centos 6.3 install & Upgrade zsh yum install zsh1yum install zsh2zsh -- version3zsh 4.3.10 (x86_64-redhat-linux-gnu) download unzip zsh 5.0.21wget http://sourceforge.net/projects/zsh/files/zsh/5.0.2/zsh-5.0.2.tar.bz2/download & tar xvjf