Linux Shell Common Command Manual (Updating)

• Check if the remote port is open for bash:

NC-nvv  $IP $PORTtelnet $IP $PORT

• Front and back switch for current task:

Ctrl + ZFG

• The first 5 characters of the Intercept variable:

${variable:0:5}

• SSH Debug Mode:

ssh -vvv [email protected]_addressssh with PEM key:ssh [email protected]_address-i KEY.PEM

• Monitoring log files

tail -F $FILE _name

Multiple Monitored scripts

Multi_tail:

#!/bin/SHfunctionClean () {#Echo[email protected]; # for file inch "[email protected]"; Do PS-ef|grep$file|grep-Vgrep|awk '{print $}'|Xargs Kill-9; DoneJobs-p|Xargs Kill-9}files=[Email protected]# when the exits, exit all ground process also. #trap"ps-ef|grep tail|grep-v Grep|awk ' {print"' $' "} ' |xargs kill-9"Exittrap"Clean $files"exit# Iterate through the each givenfilenames, for file inch "[email protected]" Do# Show Tails of eachinchbackground. Tail-F $file& Done# wait..untilCTRL +Cwait

• Crawl the complete Site directory structure with wget and store it in a local directory:

wget " index.html* " http:///hostname/-p/home/user/dirs

Create multiple directories at once:

mkdir -p/home/user/{test,test1,test2}

Lists the process trees that include child processes:

PS axwef

Create a war file, like the parameters of the tar ball decompression and compression:

File

Test hard disk write speed using the DD command:

DD if RM -rf/tmp/output.img

Get the MD5 hash of the text:

Echo " text " | Md5sum

Check the XML format:

file. xml

Extract the tar.gz into the new directory:

tar ZXVF package. tar. Gz-c New_dir

Get HTTP header information using curl:

Curl-i http://www.example.com

To modify the timestamp (YYMMDDHHMM) of a file or directory:

Touch 0712250000 file

To perform an FTP download with the wget command:

wget FTP://Username:[email protected]

Generate a random password (16 characters in the example):

tr -dc _a-z-a-z-0-9head -c${1:-+}; Echo;

To quickly back up a file:

CP SOME_FILE_NAME{,.BKP}

To access the Windows shared directory:

" Domain\User " // Dc.domain.com/share/test/dir

The command in the execution history (here is line 100th), Ksh supports the operation of the turn command of Class VI, bash generally supports up and down:

!  -

Unzip and compress (Zip compressed original file is pressed in, different from tar):

Unzip Package_name. zip -D dir_name
Zip package_name.zip files

Enter multiline text (CTRL + D to exit, or specify an exit string):

Cat > TT
Cat > TT < EOF

Create an empty file or empty an existing file:

File

command to synchronize time:

Ntpdate Your_sync_server_name

Display all TCP4 listening ports with netstat:

The netstat command-n denotes a pure digital display,-T for the TCP protocol,-U for the UDP protocol, and-L for listening

awk ' {print $4} ' Cut grep ' [0-9]* '

Run the file repeatedly, showing its output (by default, 2 seconds):

PS -ef

List of all users, group user list:

cat /etc/passwdcat /etc/group

Mount a user in read/write mode:

Mount -o REMOUNT,RW/

Mount a directory (this is a case where the link cannot be used):

Mount --bind/source/destination

Dynamically update DNS server:

86400 A $IP send EOF

Recursive grep all directories, and the Find command works with the same effect:

grep " Some_text " /path/to/dir

List the top 10 largest files:

awk ' {if ($7 > 1048576) print $7/1048576 "MB" $9} ' Sort Tail

Show remaining memory (MB):

If it is a UNIX environment, you can use the Vmstat or TOPAS command to view it

 Free grep awk ' /[0-9]/{Print $4 "MB"} '

Find all the empty empty directories under/home/user:

Find 1 -type d-empty

Get the contents of the 第50-60 line in the Test.txt file:

sed ' 50,60p '

Append text to a file in case you need to elevate permissions:

Echo " some text " sudo Tee -a/path/file

List all kill signal parameters:

Kill -L

Prohibit logging of the last session in bash history:

Kill -9 $$

Nmap scans the network for open ports:

8081 172.20. 0.0/ +

Move all files with "TXT" in the file name into the $home directory:

Find " *txt* " Xargs MV -V $HOME

Display the file in rows and lines:

Paste Test.txt Test1.txt

The progress bar in the shell:

PV Data.log

Use Netcat to send data to Graphite server:

Echo " hosts.samplehost ' Date +%s ' " 192.168. 200.2  the

Convert tabs to spaces:

Expand Test.txt > Test1.txt

Skip Bash History:

< space >cmd

Go to the previous working directory:

CD-

Split the large volume of tar.gz files (each 100MB), and then merge back:

Split Cat files* > Archive

Use curl to get the HTTP status code:

CURL-SL-w"%{http_code}\\n" www.example.com-o/dev/null

When CTRL + C is not good to make:

Ctrl + \

Get file Owner:

Stat file. txt

Block Device list:

Lsblk-f

Find files with spaces at the end of the file name:

Find Egrep "  +$ " {} \;

Find file with tab indent in file name

Find Egrep -L $'\ t' {} \;

Print the horizontal line with "=":

' %100s\n ' TR ' ' =

Linux Shell Common Command Manual (Updating)