1. ctrl+alt+t = To open terminal.
2. ctrl+shift+ = To large the terminal.
3. pwd = This command is use to know the present working directory.
4. cd = To change working directory as "cd Desktop".
5. ls = To show the content of any directory/file as a list.
6. clear = To clear the terminal.
7. gcc "filename" = To compile a file.
8. sudo = Mean "super user do" if any command is not working than use sudo to make it work.
9. su = Means "switch user" to switch user.
10.cal = To see calender.
11.date = To see date.
12.ls -a = To show hidden file.
13.man "command" = To get help for any command.
14.who = Who opens the terminal.
15.whoami = To know which user is working.
TO CREATE OR DELETE ANY DIRECTORY OR FILE.
1.mkdir "filenames" = To create a diectory.
2.rmdir "filenames" = To remove an existing directory.
3.rm -rf "filename" = If a folder contain many files than to remove a particular file freom the folder.
4.touch "file name" = To create files with different extensions in a single command.
5.gedit "file name" = The file is open in terminal and no command will work in terminal..
6.pkill "process name" = To close a process in background.
7.kill "process id" = To kill a process if process id is known.
8.ls "file name" = To check either the file is present or not.
9.cat "filename" = This command is use to show data of a file on terminal.
10.cat > "filename" = To enter data in existing file.but previous data will be deleted.
11.cat >> "filename" = To enter data in an existing file in append mode.
12.sudo apt-get install vlc = To install something from net.
13.sudo apt-get update = To check updates from net.
14.wc "filename" = To see how many lines words charcter in a file.
15.cp "source" "des" = To copy a file from one place to another.
16.mv "existing" "new" = name of file will get copied from new to existing.
17.ls -l = To see permission of all files.
18.head "filename" = To read first 10 lines of file.
19.tail "filenmae" = To read last 10 lines of file.
20.more "filename" = to read a file.
21.less "filenmae" = to read a file.
22.compress file = tar cvzf "file.tar.bz" "file"
23.extract file = tar xvzf file.tar.bz
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