Linux basic commands

1, view current directory: PWD

2, switch folder: CD destination folder relative path

3, view catalog: ls

4. View directory and file permissions: LL

5, edit a file: Vim file name = "Press the key i=" A, after editing quit do not save press ESC, then:, then press Q, and then press! , then press ENTER to Save: Wq (Save exit Yes: Wq do not save exit is: q!).

6, Reverse View files: Tail file name

7. View a file: Cat file name

8, view script Portal Shell file on server: crontab-l (sudo+ target command can switch account to root)

9, Edit Script entry Shell file on server: CRONTAB-E

10,nginx modified to see whether the syntax is correct: nginx-t

11,nginx Restart: Service Nginx reload or nginx-s reload

12, find mysqldump command: Whereis mysqldump

When the mysqldump command is invalid

Find The path of mysqldump with a find command first

Find/-name Mysqldump-print

then use the ln command to link to /usr/bin below

Ln-fs/usr/local/mysql/bin/mysqldump/usr/bin

Note /usr/local/mysql/bin/mysqldump to the path that you just exported

Ln-fs /usr/local/webserver/mysql/bin/mysqldump /usr/bin

13, the server command line accesses mysql:a,mysql-hhostname-uusername-p B, press ENTER, then enter the database password, then query the database show databases, and then select the database before doing the operation on the database. use databases;, view slow statement show Processlist;, See variables for a class of strings show global variables like '%lock% ';

Exit MySQL mode exit;

14, BACKUP database: Mysqldump-uusername-p database name >. sql

back up some tables mysqldump-h hostname-u username-p databasename table1 table2 > Db.sql

15. Backing up and packaging the database (gzip limited to Linux systems):

Mysqldump-h hostname-u username-p DatabaseName | gzip > db.sql.gz

16. Find a software: Find/-name software name

17,windows start Redis: Go to Redis folder Redis-server.exe redis.conf, clean up Redis cache redis-cli, view all cache keys*, empty flush db, get hash value Hgetall key name, get value get key name

18, look for a curl:php-m|grep curl on the server, view all installed extensions php-m, view the system uname-m, view the server system uname-a

19,redmine restart: sudo thin start-c /var/www/redmine/redmine.yml

20,sql: Date converted to timestamp Unix_timestamp () Timestamp converted to date from_unixtime ()

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Linux basic commands