Linux

Pipe symbol "|" in Linux The roleCommand format: command a| command b, which is the correct output of command 1 as the operand of command B (apply someone else's picture)1. For example: PS aux | grep "Test" looks for test in the results of PS aux.2.

causes:Because the two companies servers are backup, directory structure, files should be the same, first found that some directory data inconsistencies. Find inconsistent directoriesidea: to take out each layer of the directory to do a unified

The required packages are missing from the local Yum source currently in use and need to be added manually, and the add step is documented below.1, find the specific location of Yum, such as my in the/VAR/WWW/HTML/YUM/CENTOS/7 directory, view the

14-Week Lesson (May 9)14.1 NFS Introduction14.2 NFS server-side installation configuration14.3 NFS Configuration options14.1 NFS IntroductionThe same data is guaranteed for 3 machines. A high load, in order to share the load, found two servers B and

On Linux, with Yum installed, the downloaded RPM package is removed after the default installation is complete, and if you want Yum to install the software, you will need to modify the Keepcache parameter in the/etc/yum.conf configuration file.

When we use the Linux system, we often want to clear some files, such as: Some log files, the following describes several commonly used Linux file zeroing method:1. Using redirects[[email protected] ~]# du-h test.txt # view File size

WHOAMI view current logged on userWho views which users are logged onDate to view datesCal View CalendarClear clear screen = Ctrl + LUseradd adding userspasswd Change PasswordSu replacement user (substitute users)Man help option, view instructions

14.1 NFS Introduction14.2 NFS server-side installation configurationServer installs nfs-utils and rpcbind; client only installs Nfs-utils#yum install-y nfs-utils Rpcbind#vim/etc/exports/home/nfstestdir192.168.133.0/24 (rw,sync,all_squash,anonuid=1000

1,LINUX file structure: An inverted tree with a/root directory.2,linux's main folder:/: root directory, which is the entry for all files. Everything is a file.Bin: is a command program, startup program or Close command, is a command that all users

version 1Jdk8-linux-x642 Uninstalling Linux comes with OpenJDKSwitch to root user2.1 Query OpenJDKRpm-qa|grep Java2.2 Delete OpenJDKRPM-E--nodeps java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3.i6863 Installing the JDK3.1 switch to the installation package

14.4 Exportfs CommandCommon options-A all mount or uninstall all-R Re-mount-U Uninstalls a directory-V Show shared directory以下操作在服务端上 vim /etc/exports //增加 /tmp/ 192.168.133.0/24(rw,sync,no_root_squash) exportfs -arv

Three times about the file:1, mtime recently modified the file time, atime recently accessed the file time, ctime Recent file status changes, such as file attributes, owner, link changes.2. The time displayed with Ls-l is the time when the file was

Regular practice1.通过awk获取IP地址[[email protected] ~]# ifconfig eth2 | grep inet inet addr:10.3.151.25 Bcast:10.3.151.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe80:6e7e/64 Scope:Link[[email protected] ~]#

When we work in a terminal or console, we may not want to occupy the screen because of running a job, because there may be more important things to do, such as reading e-mails. For dense access to the disk process, we would prefer it to run during

There is a file1.txt, which reads as follows:H aa 0 0 1-9H bb 0 0 2-9H cc 0 0 2-9There is a file2.txt, which reads as follows:H aa 0 0 0-9 ASD qweH bb 0 0 0-9 fgh rtyH cc 0 0 0-9 jkl UiOIt is hoped that according to the same file1 and file2 the same

Regular expression Instances文件内容：I am oldboy teacher!I teach linux.Ilike badminto ball http:/www.baidu.commy qq num is 412421412I am oldboy teacher!I teach linux.I like badminton ball,billiard ball and chinese chess!my blog is

LS parameter-A indicates that all files, including hidden files, are displayed-d means to display the properties of the directory itself, not the contents of the directoryThe-F option displays the directory entry with A/Ls-lTotal 8Drwxrwxr-x 2

Implement upload video capture video first frame as video cover1, installation FFmpegDownload link for ffmpeg https://ffmpeg.org/download.htmlUnpacking the installation packageTAR-JXVF ffmpeg-4.0.tar.bz2Go to CatalogCD ffmpeg-4.0Compiling the

Awk simply understandsawk作用：过滤、输出内容$1 第一列， $2 第二列依次类推，NR行号，但$0表示一行，NF表示最后结尾一列-F 指定分隔符。例子：打印/etc/passwd文件的第一行（NR==1）,$0 表示一行[[email protected] ~]# awk ‘NR==1 {print $0}‘

1. Prepare the installation package, the system is minimized installation# Download and install dependencies related packages[[email protected] ~]# Yum install vim gcc make wget-y[[email protected] ~]# yum install openssl-devel zlib-devel Readlin