Reproduced shell Command 73 article

1. Check if the remote port is open for bash:

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

2. Turn the process into the background:

Ctrl + z

3. Transfer the process to the foreground:

fg

4. Generates a random hexadecimal number, where n is the number of characters:

openssl rand -hex n

5. Execute a command in a file in the current shell:

source /home/user/file.name

6. Intercept the first 5 characters:

${variable:0:5}

7.SSH Debug Mode:

ssh -vvv user@ip_address

8.SSH with PEM key:

ssh user@ip_address -i key.pem

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

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

10. Create more than one directory at a time:

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

11. List the process tree that includes the child processes:

ps axwef

12. Create the War file:

jar -cvf name.war file

13. Test HDD Write Speed:

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

14. Test Drive Read Speed:

hdparm -Tt /dev/sda

15. Get the MD5 hash of the text:

"text" | md5sum

16. Check the XML format:

xmllint --noout file.xml

17. Extract the tar.gz into the new directory:

tar zxvf package.tar.gz -C new_dir

18. Get the HTTP header information using curl:

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

19. Modify the timestamp (YYMMDDHHMM) of the file or directory:

0712250000 file

20. Perform an FTP download with the wget command:

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

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

LANG=c < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;

22. Quickly back up a file:

cp some_file_name{,.bkp}

23. Access the Windows shared directory:

"DOMAIN\user" //dc.domain.com/share/test/dir

24. The command in the execution history (this is line 100th):

!100

25. Unzip:

unzip package_name.zip -d dir_name

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

cat > test.txt

27. Create an empty file or empty an existing file:

\> test.txt

28. Sync time with Ubuntu NTP server:

ntpdate ntp.ubuntu.com

29. Display all TCP4 listening ports with netstat:

‘{print $4}‘ | cut -f2 -d: | grep -o ‘[0-9]*‘

30.qcow2 image File Conversion:

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

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

watch ps -ef

32. List of all users:

getent passwd

33.Mount root in Read/write mode:

mount -o remount,rw /

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

mount --bind /source /destination

35. Dynamically update DNS server:

86400 A $IPsendEOF

36. Recursive grep all directories:

"some_text" /path/to/dir

37. List the top 10 largest files:

‘{ if($7 > 1048576) print $7/1048576 "MB "$9 }‘ | sort -n -u | tail

38. Show remaining memory (MB):

‘/[0-9]/{ print $4" MB" }‘

39. Open vim and jump to the end of the file:

vim + some_file_name

40.Git clones the specified branch (master):

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

41.Git Switch to another branch (develop):

git checkout develop

42.Git Delete Branch (myfeature):

git branch -d myfeature

43.Git Delete Remote Branch

git push origin :branchName

44.Git Push the new branch to the remote server:

git push -u origin mynewfeature

45. Last Cat command in print history:

!cat:p

46. Last cat command in the Run history:

!cat

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

1 -type d -empty

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

‘50,60p‘

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

sudo !!

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

mount -t tmpfs tmpfs /tmpram -o size=512m

51.Grep whole words:

"name" test.txt

52. Append text to a file in case you need to elevate your privileges:

"some text" | sudo tee -a /path/file

53. List all kill signal parameters:

kill -l

54. Prohibit logging of the last session in bash history:

kill -9 $$

55. Scan the network for open ports:

8081 172.20.0.0/16

56. Set up git email:

git config --global user.email "[email protected]"

57.To sync with Master If you have unpublished commits:

git pull --rebase origin master

58. Move all files with "TXT" in the file name into the/home/user directory:

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

59. Display the file in rows and lines:

paste test.txt test1.txt

Progress bar in 60.shell:

pv data.log

61. Use Netcat to send data to Graphite server:

"hosts.sampleHost 10 `date +%s`" | nc 192.168.200.2 3000

62. Convert Tabs to spaces:

expand test.txt > test1.txt

63.Skip Bash History:

< space >cmd

64. Go to the previous working directory:

cd -

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

100m /path/to/large/archive /path/to/output/filescat files* > archive

66. Use Curl to get the HTTP status code:

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

67. Set the root password to enhance MySQL security installation:

/usr/bin/mysql_secure_installation

68. When Ctrl + C is not good to make:

Ctrl + \

69. Get the file owner:

stat -c %U file.txt

70.block Device List:

lsblk -f

71. Locate the file with a space at the end of the file name:

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

72. Find the file with the tab indent in the filename

find . -type f -exec egrep -l $‘\t‘ {} \;

73. Print a horizontal line with "=": Select Copy to put in notes

‘%100s\n‘ | tr ‘ ‘ =

Shell commands reproduced in 73 article