Linux Basic Command Explanation (i)

Basic Linux command format:

command [parameters] [path file]

The contents of square brackets can be omitted

To view the command help means:

Man command name

Summary of COMMON commands:

1 mkdir Creating a directory Mkdir/data

2 LS display directory or file ls [/data]

3 CD switch directory hierarchy cd/data; CD-Switch to last directory, CD ~ Switch home directory

4 PWD Displays the absolute path of the current directory

5 echo Displays a line of text with > or >> redirects echo "I am a Boy"

6 Cat-n Display line numbers, connect files and print on standard output, with > or >> redirect Cat Test.txt

7 CP [-AIFPRU] [source file] [target file] Copy file

-A equals-pdr

-D If the source file is a linked file, copy the linked file itself instead of the file it refers to

-F Enforcement, if the target file already exists and cannot be opened, after removing the attempt

-I if the target file already exists, ask before overwriting

-p copy along with attributes

-R recursive replication for copying directories

-U If the destination file exists, the destination file is copied before the source file

Note: If the source file has more than one, then the destination file is at the end, and the directory

8 MV Move directory or file mv/data/root/

-I if the destination file already exists, ask whether to overwrite

-F enforcement, do not ask

-U If the destination file exists, the destination file is moved before the source file

Note: If the source file has more than one, then the destination file is at the end, and the directory

9 RM Delete File

-I asks if the user is deleted correctly, using Y or N to answer

-R Delete Directory when adding this option, delete directories and files under directory, can be deleted unless empty directory

-F Force Delete, do not ask

Note: General with rm-f filename, do not prompt to delete, do not use RM-FR file is generally used to force the deletion of the directory is not prompted, too dangerous

RmDir Delete Empty Directory

-p Recursively Delete empty directories

One-by-one find command

Find. -type F-mtime +15 in the current directory, find files 15 days old by type

Find. -name test.txt-mtime-15 find test.txt files within t15 days under current directory

Note: The find command can be paired with Xargs find. -type F-mtime +30 | Xargs rm-f #删除30天以前的普通文件

Can be paired with-exec find. -name test.txt-exec rm {} \; #删除当前目录下test. txt files

Head-n line or-line number, display the file header n rows, default 10 rows

Tail-n line or-number of rows, showing the end of file n rows, default 10 rows

grep displays content that matches a specific pattern

Grep-v boy test.txt the boy who filtered out the Test.txt file, showing the rest of the content

grep boy Test.txt Displays the contents of the Test.txt file that match the boy

-E Filters multiple "a|b" simultaneously

-I is case insensitive

mkdir Creating a Directory

-p recursion to create a directory, the general first level directory does not exist when using-p, otherwise error.

Tree view directory tree

+ Alias display settings alias

Alias rm= ' Rm-i ' at this time, using RM will take the default parameter-I, with/bin/rm or, \RM can mask aliases

Unalias Cancel Alias

Which view the path to a command

Seq prints a bunch of numbers

-S "": print horizontally, separated by a symbol in quotation marks

Seq N: Print 1 to n

Seq m n:m to N

Seq m d n:m to N, step size D (in range)

TAC: Reverse Print File

Uname Display System Information

Useradd Add user Useradd Boy

passwd Change Password passwd boy

SU Switch User

General use of Su-, switch user and Shell environment

Historical Show History

history-d Line number #查看指定行历史内容

-C Clear History

Diff Compare File content differences

WHOAMI View current command line end user

Egrep equivalent to GREP-E matches multiple

Chkconfig View settings Start-up software command

SED takes various content-N cancels the default output P=print D=delete

Touch Modify file timestamp or create file

Netstat view network status Lntup or an

Lsof-i:port View Port

Linux Basic Command Explanation (i)