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This article introduces the knowledge of "what are the tips for using Linux Shell". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Check if the remote port is open to bash:

The code is as follows:

Echo > / dev/tcp/8.8.8.8/53 & & echo "open"

Let the process go to the background:

The code is as follows:

Ctrl + z

Move the process to the foreground:

The code is as follows:

Fg

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

The code is as follows:

Openssl rand-hex n

Execute a command in a file in the current shell:

The code is as follows:

Source / home/user/file.name

Intercept the first five characters:

The code is as follows:

${variable:0:5}

SSH debug mode:

The code is as follows:

Ssh-vvv user@ip_address

SSH with pem key:

The code is as follows:

Ssh user@ip_address-I key.pem

Grab the complete website directory structure with wget and store it in the local directory:

The code is as follows:

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

Create more than one directory at a time:

The code is as follows:

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

List the process trees that include child processes:

The code is as follows:

Ps axwef

Create a war file:

The code is as follows:

Jar-cvf name.war file

Test the hard drive write speed:

The code is as follows:

Dd if=/dev/zero of=/tmp/output.img bs=8k count=256k; rm-rf / tmp/output.img

Test the hard drive read speed:

The code is as follows:

Hdparm-Tt / dev/sda

Get the md5 hash of the text:

The code is as follows:

Echo-n "text" | md5sum

Check the xml format:

The code is as follows:

Xmllint-noout file.xml

Extract tar.gz to a new directory:

The code is as follows:

Tar zxvf package.tar.gz-C new_dir

Use curl to get HTTP header information:

The code is as follows:

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

Modify the timestamp of a file or directory (YYMMDDhhmm):

The code is as follows:

Touch-t 0712250000 file

Use the wget command to perform the ftp download:

The code is as follows:

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

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

The code is as follows

LANG=c

< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo; 快速备份一个文件： 代码如下: cp some_file_name{,.bkp} 访问Windows共享目录： 代码如下: smbclient -U "DOMAIN\user" //dc.domain.com/share/test/dir 执行历史记录里的命令(这里是第100行): 代码如下: !100 解压: 代码如下: unzip package_name.zip -d dir_name 输入多行文字(CTRL + d 退出): 代码如下: cat >

Test.txt

Create an empty file or empty an existing file:

The code is as follows:

> test.txt

Synchronize time with Ubuntu NTP server:

The code is as follows:

Ntpdate ntp.ubuntu.com

Use netstat to display all tcp4 listening ports:

The code is as follows:

Netstat-lnt4 | awk'{print $4}'| cut-f2-d: | grep-o'[0-9] *'

Qcow2 image file conversion:

The code is as follows:

Qemu-img convert-f qcow2-O raw precise-server-cloudimg-amd64-disk1.img\

Precise-server-cloudimg-amd64-disk1.raw

Run the file repeatedly to show its output (the default is once every 2 seconds):

The code is as follows:

Watch ps-ef

List of all users:

The code is as follows:

Getent passwd

Mount root in read/write mode:

The code is as follows:

Mount-o remount,rw /

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

The code is as follows:

Mount-- bind / source / destination

Dynamically update DNS server:

The code is as follows:

Nsupdate

< test1.txt Skip bash history: 代码如下: < space >

Cmd

Go to the previous working directory:

The code is as follows:

Cd-

Split the large tar.gz file (each 100MB) and merge it back:

The code is as follows:

Split-b 100m / path/to/large/archive / path/to/output/files

Cat files* > archive

Use curl to get HTTP status code:

The code is as follows:

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

Set the root password to strengthen the MySQL security installation:

The code is as follows:

/ usr/bin/mysql_secure_installation

When Ctrl + c doesn't work:

The code is as follows:

Ctrl +\

Get the file owner:

The code is as follows:

Stat-c% U file.txt

Block device list:

The code is as follows:

Lsblk-f

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

The code is as follows:

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

Find files with tab indents in their names

The code is as follows:

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

Print a horizontal line with "=":

The code is as follows:

Printf'0s\ n' | tr''=

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