common alexa commands

Compress unzip command: gzip (compress file, do not keep original file.) This command cannot compress the directory)Compression decompression command: Gunzip (unzip the. GZ zip file)Compression decompression Command: TAR (package compressed directory or unzip the compressed file. Packaging means to package a directory into a file, not the same as compression. The tar command can be compressed at the same time as the package, resulting in a. tar.gz file)Compression decompression command: ZIP (com

chmod [{ugoa}{+-=}{rwx}] [file or directory][mode=421] [File or directory]-R Recursive modificationExample: chmod g+w,o-r file or directoryBut generally with digital configuration permissions, example: chmod 766 files or directoriesChown User files or directories: Change the owner of a file or directory, only root can use the commandCHGRP User files or directories: Change the owning group of the file live directory, only root can use this commandUmask [-S] View the default permissions for the cu

Df-h user-friendly display file system partition informationNote: The directory in Linux is also a file, do not confuse the following directory file to say.The traditional way to view the file size can be used: ll-h/directory/file name, you can see the size of the file, but if you want to see the size of a directory, using the command: ll-h/directory, can only view the current directory information size, rather than the current directory of all the contents of the total file size occupied. For e

adm file1 #改变文件file1 belongs to the group ADM#其中ADM is a group already in the system. [Why change the user group, how to use the group?] Let's study later ...]4,umask/bin/umask # display, set default permissions for filesumask [-s]//-s Displays the new file or directory default permissions in rwx form, more intuitive e.g. Umask// View default permissions, compare traditional#显示0022 :0- special permission bit,022- user Rights bit [u,O], represents the mask value;Calculation: 777-022 = 755//

,g=rx,o=rx[[email protected] ~]# mkdir/tmp/test[[email protected] ~]# ls-ld/tmp/tes Tdrwxr-xr-x. 2 root root 4096 January 8 00:32/tmp/test[[email protected] ~]#when creating a new file, the default is no execute permission for security purposes . For example, create a new Test1.txt file under the TMP directory with the following default permissions:[Email protected] ~]# touch/tmp/test1.txt[[email protected] ~]# ls-l/tmp/test1.txt-rw-r--r--. 1 root root 0 January 8 00:34/tmp/test1.txt[[email

within 5 days" is find /-mtime-5 , find "5 days ago the day of the changed file name" is find /-mtime 5 , find "5 days ago changed file name" is Find/-mtime +5. We can see that there is no "+,-" difference is very big. Here is a diagram to illustrate: 　　by this time axis we can know that the rightmost is the current time, + 5 Represents a file name that is greater than or equal to 6 days ago, 5 represents a file name that is less than or equal to 5 days, and5 is the file name that represents

: Using here doc to generate filesOutput:[Email protected] test]#Cat>log.txt EOF>Hello> World>Linux> pwd=$ (pwd)>Eof[[email protected] test]#ls-L Log.txt-rw-r--r--1Root rootPanax Notoginseng Ten- - -: -Log.txt[[email protected] test]#CatLog.txt helloworldlinuxpwd=/opt/soft/Test[[email protected] test]#DescriptionNote that the Bold section, here Doc, can be used for string substitution.Note:TAC (Reverse list)Command:TAC Log.txtOutput:TAC log.txt PWD=/opt/soft/TestlinuxworldhelloDescriptionThe TA

Common CentOS commands: find Common shortcuts Common shortcuts Ctrl + u: Clear ctri + k: Clear ctrl + d: leave the terminal when this action is null. If it is not empty, delete a character ctrl + h: delete the character ctrl + e before the cursor: Move to the cursor ctrl + a: move to the cursor ctrl + f: Move a charac

project path of Tomcat under WebApps, reflected to the rootDocker one-step installation RABBITMQDocker run-d--name rabbitmq--publish 5671:5671--publish 5672:5672--publish 4369:4369--publish 25672:25672--publish 15671:15671--publish 15672:15672 rabbitmq:managementNote: If the port is turned on, the firewall must have a custom port open under the server, and the security groupDocker installation RedisDocker run Redis--name redis-p 6379:6379-d redis-serverDocker installation NginxDocker Pull Nginx

directory from the remote directory via SSHTar CF-. | (cd/tmp/backup; tar xf-) copy a directory locally to another location, preserving the original permissions and linksFind/home/user1-name ' *.txt ' | Xargs Cp-av--target-directory=/home/backup/--parents Find and copy all files ending with '. txt ' from a directory to another directoryFind/var/log-name ' *.log ' | Tar CV--files-from=-| bzip2 > log.tar.bz2 Find all files that end with '. Log ' and make a bzip packageDD If=/dev/hda of=/dev/fd0 b

Common Linux commands and some common problemsCommon linux commands1. View Linux Version 1.1. View linux kernel version uname-r or uname-a1.2. view the linux kernel version cat/proc/version1.3. view the Linux host name hostname 2. Start or close the FTP service. vsftp start 3 view linux hard disk size df-lh4 view linux memory size free5 view CPU count ls/proc/acp

Label:Function: From_unixtime (Unix_timestamp,format) timestamp to string date format%M month name (January ... December)%W Week name (Sunday ... Saturday)%d The date of the month with English prefixes (1st, 2nd, 3rd, etc.). ）%Y year, number, 4 bit%y year, number, 2 bit%a abbreviated weekday name (Sun ... Sat)Number of days in the month of%d, number (00 ...). 31)Number of days in%e month, number (0 ... 31)%m Month, number (01 ... 12)%c month, number (1 ... 12)%b Abbreviated month name (Jan ... D

BranchesGit branch-r# Start Tracking One remote branchGit branch--track some_branch origin/some_branch# Change to the branch locallygit checkout Some_branch# make changes and commit them locally....# Push your changes to the remote repository:git pushTo create a remote branch# Create a new branch locallyGit branch Name_of_branchgit checkout Name_of_branch# edit/add/remove Files # Commit your changes locallygit add fileNameGit commit-m Message# Push changes and new branch to remote repository

// Class Name: EcanDOS// Function: Common DOS Commands// Author: Liu dianwu// Time:Using System;Using System. Collections. Generic;Using System. Text;Using System. IO;Using System. Diagnostics;Using System. Runtime. InteropServices;Namespace Ecan{Public class EcanDOS{// Introduce API functions[DllImportAttribute ("user32.dll")]Private static extern int FindWindow (string ClassName, string WindowName );[DllI

Common commands for creating and managing MySQL Databases: 1, use the show statement to find out what database currently exists on the server: Mysql> show DATABASES; 2, create a database Mysqldata mysql> CREATE DATABASE Mysqldata; 3, select the database you created mysql> use Mysqldata; (press ENTER to appear when the database changed the operation success!) ) 4, see what tables exist in the current

Tags: cron splay free head command watch Eid find more gzipThis article summarizes some of the most commonly used commands under Linux to keep up-to-date. The main learning resources are:1. "Brother Bird's Linux private cuisine-Basic article" Fourth edition2. "Linux is the way to learn"3. The total directory of Linux command series I have used4. Blog Park-a daily Linux command series5.linux command five-minute series6. Other Internet information, Goog

compression method (high compression ratio). The system default value is 6.Note: gzip cannot compress the entire directory. You can use tar to package first, then compressPsl long format output;U displays the process in the order of the user name and start time;J Use the task format to display the process;F to display the process in a tree-shaped format;A shows all processes of all users (including other users);X shows the process without control terminal;R shows the running process;WW avoids d

1 Viewing the default and supported storage enginesMysql->show engines;2 View MySQL's current default storage engineMysql->show variables like '%storage_engine% ';3 Viewing the storage engine for the test Database buyer tableMysql->show table status from test where name= ' buyer ';4 Modifying the table's storage engineMysql->alter table Buyer engine= ' InnoDB ';5 Backing up the database testAdministrator->mysqldump-uroot-padmin Test > D:/test.bake.sqlMySQL C