Linux Common Command Summary

Learn the script for a few days, summarize under the Linux Debian Script common commands.

Linux

1. Add Delete account Useradd/userdel

2. Modify "Zhang San" password passwd Zhang San or echo "User:password" |chpasswd

3. Find grep {-r path} {file} "Find what" or grep-rrni "content" to find "content" in all files in the current directory.

4.PWD Output Current Path

5.tail-n rows shows the last n rows of the file

6.time time/xxx.sh View Script Runtime

7.cut {-d ' split by this character '} {-F 2-5 for segmented area, 2-5 zone} {-C 1-8 pre-cut 1-8-bit} eg:8-bit random password $RANDOM |md5sum|cut-c 1-8

8.shift for function or script input parameters before further

9.test-eq = =-ne! =-gt >-lt <-le <=-ge >=-e file exists-f file-D directory

Multi-with if test ... Or test ... $? (whether the previous statement was executed successfully)

If [];then if test-f./xx.txt; then

Expression A-expression a

else elif []; then

Expression b-expression B

Fi Else

Expression C

Fi

One. While the Read line

Do

Echo $line

Done

12.for i in ' seq 1-5 '

Do

Echo $i

Done

Eg:mybash.sh-a-B 1-c1 (next to)

While getopts AB:C::

Do

Case $ARGV in

A

echo "a";;

b

Bb= $OPTARG echo $bb;;

C

Cc= $OPTARG echo $cc;;

*) exit 1;;

Esac

Done

14.echo-n no return output-e support "\n\t ..."

15.. + library file (Reference library)

16. Package Tar ZCVF file name directory Eg:tar zcvf/root/etc/etc.tar.gz/etc >>file 2>>file Unpack tar zxvf files directory

17. Arithmetic Operation $ ((&i + 1)) equals i++ or expr $i \+1

Fun () {

echo $

}

Fun 1 2

#函数调用

. Cat <<eof

1.aaa

2.bbb

Eof

#打印菜单

20. [[string comparison equals = greater than > less than <]]

[Integer judgment-eq-nq-f-D ...]  && YES | | NO

I=1.

echo "String${i}" output string1

Seq 3 Output

1

2

3

Back quotes Echo ' seq 3 ' and echo $ (seq 3) Output 1 2 3

Seq-s "=" 3 output 1=2=3 seq-w 10 output n/a 02 .... 10

$PATH path $UID User ID $ #输入参数个数 $? If the previous instruction is executed correctly, the first parameter $RANDOM a random number

24. Stream redirect Cat 1.txt >/dev/null 2>&1 (2 with 1) 0 standard input 1 standard output 2 error output

25.raad-p "Input:" var read input to parameter Var

26.su root root user logout exit root su user users

27.FG back to Hang program general with Ctrl +z (pause) shared BG Suspend program continues execution

28.=~ and regular expressions

29.vim config file vim ~/.vimrc input set Nu (show line number) syntax on (syntax highlighting)

30. Add path Path 1 "Vim/etc/profile 2" append expot path= "MyPath: $PATH" 3 "Source/etc/profile

31. Set Prophecy lang=en Change English

Dos2unix myfile windos file to UNIX file

diff file1 file2 table file1 file2 and Vimdiff

34.>> Append file > Inflow < outflow | Pipeline

basename file name dirname directory

36. Command statement may error can be added | | Exit 2

PNs. Touch + File Creation file

Awk-f ' split character ' {printf $ awk-f} ' [' Recognize multiple character splits '] ' begin{printf} {} end{} '

39.find directory operation-type f file d directory C character device-mtime modified +1 days ago-11 days-name "Name *.sh"-size file size

Eg: delete current directory 7 days ago SH file find./-type f-name "*.sh"-mtime +7 |xargs RM

40.xargs for commands that do not support pipelines

RM-RF forced recursive deletion

A. alias custom directive permanently added VIM/ROOT/.BASHRC VIM/USER/.BASHRC add rm-i mv-i cp-i ls-a ls-al

Kill-9 Strong killing process

The. Sort Uniq

Curl-i www.baidu.com Server header information curl-s ip.cn?ip=201.37.45.107 query IP address

Not to be continued ...

Reference URL:

Http://edu.51cto.com/course/course_id-6068.html

Linux Common Command Summary