Linux share 2 command LS CD type learn

One, ls command: List file directory information

1. What each field means

linux:/home/zjk# ls-l Sshd_config

-rw-r-----1 rootroot 3902 Apr 08:45 sshd_config

-rw-r-----:

first column File type; " - " means file, " d "means directory," Span style= "FONT-SIZE:16PX;" >l "means linked file," c "means the character device," b "represents a block device," s "means socket p "means named pipe

file permissions: Front 3 bit owner: rw-420 , Intermediate 3 Genus Group: r--4 , after 3 bit other users: ---0

r: Reading, W: Write, x: Execution

second column number of file links 1

third column Document Owner Root

Fourth Column Group of file genera Root

Fifth Column File Size 3902

Sixth Column file Last modified time APR 08:45

linux:/home/zjk# Stat Sshd_config

File: ' Sshd_config '

size:3902 blocks:8 IO block:4096 Regular file

device:807h/2055d inode:1974288 links:1

Access: (0640/-rw-r-----) Uid: (0/root) Gid: (0/root)

access:2015-06-0110:31:49.000000000 +0800 Last access Time

modify:2015-04-2908:45:06.000000000 +0800 The last file content modification time, and modify this time, the remaining two time also changed;

change:2015-04-2908:45:06.000000000 +0800 last file property change Time

Seventh Column file name Sshd_config

2 , Common parameters: (combined use)

- L: lists file details, such as file type, permissions, creation time, owner / group, etc.;

- R: display in reverse order of a rule;

- T: sort by time;

-A : list all files, including the " . "The beginning of the hidden file and other information;

- D: display directory attribute information;

- S : Sort by file size;

- S: the output file size at the end or beginning of the file; KB as units;

- F : Add character description file type at the end; / "Catalog," * "executable file," @ "compliant links," = "sockets," | " FIFOS

Other parameters:

-A : Lists the current directory " . "and parent directory" .. "other than documents;

- R : Recursive display of file information;

- I.: Display the index node well;

- L: list file link names;

ls. Show current directory ls: Show Top level directory

See command: Mans LS

Instance:

A , output in reverse order of time

linux:/home/zjk# ls-l

Total 24

-rw-r--r--1 root root one may 1.txt

-rw-r--r--1 root root 5 07:56 inet

-rwxr--r--1 root root 1305 may 12:28 res_monitor.sh

DRWXR-XR-X2 root root 4096 June 2 10:50 test

-rwxr--r--1 root root 07:47 test.sh

linux:/home/zjk# ls-ltr

Total 24

-rw-r--r--1 root root 507:56 inet

-rwxr--r--1 root root 07:47 test.sh

-rw-r--r--1 root root one may 1.txt

-rwxr--r--1 root root 1305 may 12:28 res_monitor.sh

drwxr-xr-x2 root root 4096 June 2 10:50 test

B , display file type and recursive output

linux:/home/zjk# ls-f

1.txt inet res_monitor.sh* sshd_config test/test.sh*

linux:/home/zjk# Ls-al

Total 32

Drwxr-xr-x 3 SSHUSR users 4096 June 2 10:50 .

drwxr-xr-x29 SSHUSR users 4096 June 2 11:44 .

-rw-r--r--1 root root one may 1.txt

-rw-r--r--1 root root 5 07:56 inet

-rwxr--r--1 root root 1305 may 12:28res_monitor.sh

-rw-r-----1 root root 3902 Apr 08:45sshd_config

Drwxr-xr-x 2 root root 4096 June 2 10:50 test

-rwxr--r--1 root root 07:47 test.sh

linux:/home/zjk# ls–al

Total 24

-rw-r--r--1 root root one may 1.txt

-rw-r--r--1 root root 5 07:56 inet

-rwxr--r--1 root root 1305 may 12:28 res_monitor.sh

-rw-r-----1 root root 3902 Apr 08:45 sshd_config

DRWXR-XR-X2 root root 4096 June 2 10:50 test

-rwxr--r--1 root root 07:47 test.sh

linux:/home/zjk# ls-ld test

DRWXR-XR-X2 root root 4096 June 2 10:50 test

testdg01:/home/sshusr/zjk# mkdir-p Test/test1 Test/test2

testdg01:/home/sshusr/zjk# ls-r test

Test

Test1 Test2

Test/test1:

Test/test2:

Second,CD command: Switch directory

1 , switch to the specified user home directory, if you have directory permissions for the user

linux:~ # pwd

/root

linux:~ # CD~ZJK Switch to sshusr User Home Directory

linux:/home/zjk# pwd

/home/zjk

linux:~ # SU-ZJK

[Email PROTECTED]:~>CD ~root

-BASH:CD:/root:permission denied switch failed, normal user to Root The directory does not have permissions;

2. switch to the current user home directory

linux:/home/zjk# CD ~

linux:~ # pwd

/root

3 , the current directory and the previous directory switch back and forth

linux:~/inst-sys# pwd

/root/inst-sys

linux:~/inst-sys# CD-

/home/zjk

linux:/home/zjk# pwd

/home/zjk

linux:/home/zjk# CD-

/root/inst-sys

linux:~/inst-sys# pwd

/root/inst-sys

iii. Type command: Displays the specified command type  

built-in commands: Shell Builtin

External command: The file system has an executable file corresponding to the command name under a path

linux:~/inst-sys# type pwd

pwd is a shellbuiltin built-in commands

linux:~/inst-sys# Type LL

ll is aliased to ' ls-l ' alias Command

linux:~/inst-sys# type ls

LS is aliased to ' ls $LS _options '

linux:~/inst-sys# type mkdir

mkdir Is/bin/mkdir executable file under directory

This article is from the "Ant World" blog, please be sure to keep this source http://ants0world.blog.51cto.com/10301278/1685644

Linux share 2 command LS CD type learn