Some of the Linux shell uses tips to collect _linux shell

Check to see if the remote port is open to bash:

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echo >/dev/tcp/8.8.8.8/53 && echo "Open"

To get a process into the background:

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Ctrl + Z

To move a process to the foreground:

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Fg

Produces a random hexadecimal number where n is the number of characters:

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OpenSSL Rand-hex N

Execute a command in a file in the current shell:

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Source/home/user/file.name

Intercept the first 5 characters:

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${variable:0:5}

SSH Debug Mode:

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SSH-VVV user@ip_address

SSH with PEM key:

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SSH user@ip_address-i Key.pem

Use wget to crawl the complete site directory structure and store it in the local directory:

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Wget-r--no-parent--reject "index.html*" http://hostname/-p/home/user/dirs

Create multiple directories at once:

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

Lists the process trees that include child processes:

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PS AXWEF

To create a war file:

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JAR-CVF Name.war File

To test hard drive write speed:

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DD If=/dev/zero of=/tmp/output.img bs=8k count=256k; Rm-rf/tmp/output.img

Test hard drive Read speed:

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Hdparm-tt/dev/sda

Gets the MD5 hash of the text:

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Echo-n "Text" | Md5sum

Check XML format:

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Xmllint--noout File.xml

To extract the tar.gz into a new directory:

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Tar zxvf package.tar.gz-c New_dir

To obtain HTTP header information using curl:

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

To modify a file or directory timestamp (YYMMDDHHMM):

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Touch-t 0712250000 File

To perform FTP downloads with the wget command:

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Wget-m Ftp://username:password@hostname

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

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Lang=c </dev/urandom tr-dc _a-z-a-z-0-9 | Head-c${1:-16};echo;

To quickly back up a file:

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CP SOME_FILE_NAME{,.BKP}

To access the Windows shared directory:

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Smbclient-u "Domain\User"//dc.domain.com/share/test/dir

Execute the commands in the history (this is line 100th):

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!100

Extract:

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Unzip package_name.zip-d Dir_name

Enter multiple lines of text (CTRL + D exit):

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Cat > Test.txt

To create an empty file or empty an existing file:

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> Test.txt

Sync time with Ubuntu NTP server:

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Ntpdate ntp.ubuntu.com

Display all TCP4 listening ports with netstat:

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Netstat-lnt4 | awk ' {print $} ' | Cut-f2-d: | Grep-o ' [0-9]* '

Qcow2 Mirrored file Conversion:

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Qemu-img convert-f qcow2-o Raw precise-server-cloudimg-amd64-disk1.img \
Precise-server-cloudimg-amd64-disk1.raw

Run the file repeatedly, displaying its output (default is 2 seconds):

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Watch Ps-ef

All Users list:

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Getent passwd

Mount root in Read/write mode:

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Mount-o REMOUNT,RW/

Mount a directory (this is the case where links are not available):

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Mount--bind/source/destination

To update DNS server dynamically:

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Nsupdate < <eof
Update add $HOST 86400 A $IP
Send
Eof

Recursively grep all directories:

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Grep-r "Some_text"/path/to/dir

List the top 10 largest files:

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Lsof/| awk ' {if ($ > 1048576) Print $7/1048576 MB ' $} ' | Sort-n-u | Tail

Show remaining memory (MB):

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free-m | grep Cache | awk '/[0-9]/{print $ MB '} '

Open vim and skip to end of file:

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Vim + some_file_name

Git clone Specifies branch (master):

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git clone git@github.com:name/app.git-b Master

Git switches to another branch (develop):

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git checkout Develop

Git Delete Branch (myfeature):

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Git branch-d myfeature

Git Deletes a remote branch

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git push origin:branchname

Git pushes the new branch to the remote server:

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Git push-u origin mynewfeature

Print last Cat command in history:

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!cat:p

The last cat command in the Run history:

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!cat

Find all the empty directories under/home/user:

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Find/home/user-maxdepth 1-type D-empty

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

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< Test.txt sed-n ' 50,60p '

Run the last command (if the last command is Mkdir/root/test, the following will run: sudo mkdir/root/test):

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Sudo!!

Create temporary RAM file System –ramdisk (create/tmpram directory first):

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Mount-t Tmpfs Tmpfs/tmpram-o size=512m

Grep whole words:

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Grep-w "Name" Test.txt

Append text to a file when elevated permissions are required:

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echo "Some text" | sudo tee-a/path/file

List all kill signal parameters:

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Kill-l

To prevent the last session from being logged in bash history:

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Kill-9 $$

Scan the network for open ports:

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Nmap-p 8081 172.20.0.0/16

Set up git email:

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git config--global user.email "me@example.com"

To-sync with master If you have unpublished commits:

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Git pull--rebase Origin master

Move files containing "TXT" in all file names into the/home/user directory:

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Find-iname "*txt*"-exec mv-v {}/home/user \;

To display files in line by row:

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Paste Test.txt Test1.txt

The progress bar in the shell:

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PV Data.log

Use Netcat to send data to Graphite server:

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echo "Hosts.samplehost ' date +%s '" | NC 192.168.200.2 3000

Convert tabs to spaces:

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Expand Test.txt > Test1.txt

Skip Bash History:

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< space >cmd

Go to the previous working directory:

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CD-

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

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Split–b 100m/path/to/large/archive/path/to/output/files
Cat files* > Archive

Use Curl to get HTTP status code:

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Curl-sl-w "%{http_code}\\n" Www.example.com-o/dev/null

Set root password to enhance MySQL security installation:

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/usr/bin/mysql_secure_installation

When the CTRL + C is bad:

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Ctrl + \

Get file Owner:

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Stat-c%u file.txt

Block Device list:

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Lsblk-f

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

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Find. -type f-exec egrep-l "+$" {} \;

Find a file with a tab indent file name

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Find. -type f-exec egrep-l $ ' t ' {} \;

Print a horizontal line with "=":

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printf '%100s\n ' | TR ' =