gw basic commands

save new file name 4, delete text • Small x: Delete a character after the cursor position • Large x: Delete one character before the cursor position n+x (small): Delete the n characters that follow the cursor position n+x (Large): delete the n characters preceding the cursor position DD: Delete the row where the cursor is located n+ DD: Delete the line with the cursor and the five lines below. (from the line where the cursor is located to the next five lines (including the cursor row) 5, copy

?imageMogr2 /auto-orient/strip%7cimageview2/2/w/1240 "alt=" 1240 "/>echo {0..20..2} displays 0-20 all digits with a step size of 2, arithmetic progression650) this.width=650; "Src=" Http://upload-images.jianshu.io/upload_images/6886239-9a8eb98334f5cc32.png?imageMogr2 /auto-orient/strip%7cimageview2/2/w/1240 "alt=" 1240 "/>echo "host name is ' hostname '" command nesting command, inverted single quote ' '650) this.width=650; "Src=" Http://upload-images.jianshu.io/upload_images/6886239-3095000e2d7

: Install python package Redis pip Unstall redis : Uninstall pip show--files redis :p IP View installed packages pip list--outdated : Check for updates Source Code Package compilation installation ? Source code package (usually have install file) such as hello-2.2.tar.bz2, download copy to/opt; TAR-JXVF hello-2.2.tar.bz2 : Unzip ./configure--prefix=/opt/Software Catalog name : Prepare for compilation, plus prefix manually specify the installation pat

Linux cloud computing cluster Architecture Study Notes: 1-1 rhel7 basic commands, Study Notes rhel7 1-3-RHEL7Basic commands 1.1LinuxTerminal introduction Shell prompt Bash Shell basic syntax. 1.2Use of basic commands: ls, pwd,

Basic usage of vim commands using vi/vim 1. basic concepts of vi there are basically three states: command mode and Insertmode) compared with lastlinemode, Each mode has the following functions: 1) Command Line... basic usage of vim commands using vi/vim 1.

Mysql -- mysql basic operation command: selectDATE_FORMAT (runTime, % Y-% c-% d) fromhdfsPicLogtwherepathlike % liveEpg3 % andcount30andDATE_FORMAT (runTime, % Y-% c-% d) 2013-10-30; change the primary key to primary key auto-increment: altertablehdfsPicLogm Mysql -- mysql basic operation command: select DATE_FORMAT (runTime, '% Y-% c-% D ') from hdfsPicLog t where path like '% liveEpg/3/%' and count 30 and

Basic concepts and commands for CentOS users and groupsUser Group:Group type:Administrator GroupCommon User GroupSystem GroupLogon Group Group ID: GroupID and GroupID (Normal user 1-65536)Administrator group: 0 Common User Group: System group: CentOS 5, 6: 1-499 CentOS 7: 1-999 Logon group: CentOS 5, 6: 500 + CentOS 7: 1000 + Name resolution: groupname Resolution Library:/etc/group Group type: user-center

Basic configurations of Cisco routers and Cisco router configuration commands En -- enter the privileged mode config t -- enter the global configuration mode wr (OR) -- save the configuration (otherwise, the configuration fails before the power-off) 1. Set the password for entering the vro Console In global configuration mode, enter line console 0 --- enter the '0' Interface password 123 -- set the password

file from the 512-byte block position represented by the number variable.-C number starts reading the specified file from the byte position represented by the number variable.-F assumes that the input file is a regular file or assumes that the file parameter specifies a FIFO (first in and out),Then the tail command will not terminate after the last specified unit of the input file has been copied, but continueRead and copy additional units from the input file (when these units are available).If

we can find out which program is listening on that port and thus shutting it down.3. One of the 80 ports is monitored by Apache, then the port can no longer be monitored by other applications. (a port can only be monitored by one program).4. The port is divided into the famous port 1-1024, other ports can be assigned by themselves.　　How Apache goes to configure portsApache software configuration is configured in the httpd.conf file, the file is in the Apache installation directory of the ConfIn

to store the data, but the 122 Byte warehouse in the data kicked off.LRU removal mechanismmemcached Expiration data removal mechanism:When a value expires, it is not removed from memory, so stats statistics, Curr_items still have its information;When the value is taken, determine whether it expires, if expired, return empty, and empty, at this time curr_items is reduced;There have been no get before, will not automatically delete;Use an empty chunk only when a new value occupies its place.This