Linux environment variables, cp,mv command, More,less,cat,tail,head, use

Linux environment variables, cp,mv command, More,less,cat,tail,head, use

[Email protected] ~]# cp/usr/bin/ls/tmp/

[Email protected] ~]# path= $PATH: Use of/tmp/path

[Email protected] ~]# echo $PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/tmp/

[[email protected] ~]# Vi/etc/profile Permanent Entry Add Path variable value in this configuration file

[[email protected] ~]# echo $PATH use of new assignments

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/tmp/

[Email protected] ~]# Path=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

Cp

[[email protected] ~]# cp-r/dabaitu//tmp/copy directory with option-R

[[email protected] ~]# cp-r/tmp/nc//TMP/NC/CP Copy a file if the target file exists, he will put the original directory under the target directory.

If the target directory does not exist, he will copy the original directory, modify a name.

MV Command

[Email protected] tmp]# mkdir 1.txt If you change the name in the same directory if the target file already exists, he will ask if he wants to overwrite it.

[Email protected] tmp]# MV 1.txt/2.txt If the target is a directory and the directory does not exist, he will change the name of the directory. If the target directory exists, he will put the original target In the catalogue.

[[email protected] tmp]# ls

2.txt Alex systemd-private-2b74b96d2c354f119f60360cbd9383fa-ntpd.service-0d Dvfj

Aegis-<guid (5A2C30A2-A87D-490A-9281-6765EDAD7CBA) > NC

Cat

[[email protected] ~]# cat-a/etc/passwd Cat is to view the contents of a file-A is at the end plus a $

root:x:0:0:root:/root:/bin/bash$

bin:x:1:1:bin:/bin:/sbin/nologin$

[[email protected] ~]# cat-n/etc/passwd-n can show the line number

1 Root:x:0:0:root:/root:/bin/bash

2 Bin:x:1:1:bin:/bin:/sbin/nologin

More

Also view the contents of the file

[[email protected] ~]# more/etc/passwd is press the space a screen down view by Shift+b online view

Root:x:0:0:root:/root:/bin/bash

Bin:x:1:1:bin:/bin:/sbin/nologin

Daemon:x:2:2:daemon:/sbin:/sbin/nologin

[[email protected] ~]# wc-l/etc/passwd can see how many lines of a file

26/etc/passwd

[[email protected] ~]# head/etc/passwd view a file cast 10 lines

Root:x:0:0:root:/root:/bin/bash

Bin:x:1:1:bin:/bin:/sbin/nologin

Daemon:x:2:2:daemon:/sbin:/sbin/nologin

Adm:x:3:4:adm:/var/adm:/sbin/nologin

Lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

Sync:x:5:0:sync:/sbin:/bin/sync

Shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown

Halt:x:7:0:halt:/sbin:/sbin/halt

Mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

Operator:x:11:0:operator:/root:/sbin/nologin

[[email protected] ~]# tail/etc/passwd look at the end of a file 10 lines

Dbus:x:81:81:system message Bus:/:/sbin/nologin

Polkitd:x:997:995:user for Polkitd:/:/sbin/nologin

Tss:x:59:59:account used by the trousers package to sandbox the TCSD Daemon:/dev/null:/sbin/nologin

Postfix:x:89:89::/var/spool/postfix:/sbin/nologin

Sshd:x:74:74:privilege-separated Ssh:/var/empty/sshd:/sbin/nologin

Ntp:x:38:38::/etc/ntp:/sbin/nologin

NSCD:X:28:28:NSCD Daemon:/:/sbin/nologin

Tcpdump:x:72:72::/:/sbin/nologin

Dabaitu:x:1000:1000::/home/dabaitu:/bin/bash

User:x:1001:1001::/home/user:/bin/bash

[[email protected] ~]# head-n 2/etc/passwd only look at the first two lines

Root:x:0:0:root:/root:/bin/bash

Bin:x:1:1:bin:/bin:/sbin/nologin

[[email protected] ~]# tail-n 2/etc/passwd only look at the following two lines

Dabaitu:x:1000:1000::/home/dabaitu:/bin/bash

User:x:1001:1001::/home/user:/bin/bash

[[email protected] ~]# tail-f/etc/passwd View a log or document of a dynamic file

Usage of less

Press the Space one screen one screen down see press the direction up and down ctrl+b upward ctrl+f down press n,n down press Q exit

Press/and? Search for a keyword and make a volume display

Shift+g forward, shift+g, backward.

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Linux environment variables, cp,mv command, More,less,cat,tail,head, use