Basic commands for Linux files

Basic commands for text (CAT, TAC, head, tail, more, less, rev)

Viewing the contents of a file cat

cat-n/etc/passwd can list serial number display file

[Email protected] ~]# cat-n/etc/passwd 1root:x:0:0:root:/root:/bin/bash 2bin:x:1:1:bin:/bin:/sbin/nologin 3 Daemon:x:2:2:daemon:/sbin:/sbin/nologin 4adm:x:3:4:adm:/var/adm:/sbin/nologin 5lp:x:4:7:lp:/var/spool/lpd:/sbin/ Nologin 6sync:x:5:0:sync:/sbin:/bin/sync

cat-a add $ suffix at the end of each line

[Email protected] ~]# cat-a/etc/resolv.conf; Generated By/sbin/dhclient-script$nameserver 192.168.20.2$nameserver 8.8.8.8$$

View the contents of a file in a paginated display

More Space Key page return to the top shift Q key to exit

viewing the contents of a file less  

The Space bar page, enter the key down, you can press the arrow key up Move Down, pageup PageDown can page up and down, Q key exit

Ctrl+f PAGE Down

Ctrl+b PAGE Up

J Flip Down

K Upward Turn

G jump to the last line

G Jump to the first line

/Search Down

？ Go up search

Show only the first 10 lines of the file head

Head-n 20/etc/passwd Displays the first 20 lines of content

HEAD-N20/ETC/PASSWD display the first 20 lines, no spaces behind n

HEAD-20/ETC/PASSWD the middle parameter n can be omitted, the middle cannot have the space

[Email protected] ~]# head-5/etc/passwdroot:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/nologindaemon:x : 2:2:daemon:/sbin:/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologinlp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

Only 10 lines of content are displayed after the file tail

Tail-n 2/etc/passwd shows the last 2 rows, and the same middle parameter n can be omitted

Tail-f/var/log/messages #-F Dynamic View System log

[Email protected] ~]# tail-5/etc/passwdsaslauth:x:499:76: "SASLAUTHD user":/var/empty/saslauth:/sbin/ Nologinpostfix:x:89:89::/var/spool/postfix:/sbin/nologinsshd:x:74:74:privilege-separated SSH:/var/empty/sshd:/ Sbin/nologinuser1:x:500:501::/home/user1:/bin/bashuser2:x:501:502::/home/user2:/bin/bash

Display the contents of the file upside down Rev

[[email protected] ~]# echo ' AABB ' >huang[[email protected] ~]# cat Huangaabb[[email protected] ~]# rev Huangbbaa

Display the contents of a file upside-down TAC

[email protected] ~]# cat Huangaabbcc[[email protected] ~]# TAC Huangccbbaa

This article is from the "Model Student's Learning blog" blog, please be sure to keep this source http://8802265.blog.51cto.com/8792265/1621909

Basic commands for Linux files