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  1. # Linux Basic Commands #
  2.  
  3. - Update Linux built-in package
  4.     - ``` sudo apt-get update ```
  5. - Install software
  6.     - ``` sudo apt install package_name ```
  7. - Uninstall software
  8.     - ``` sudo apt-get purge package_name ```
  9. - List of file & folder
  10.   - ``` ls ``` or ``` ls -l ```
  11. - Change directory to root
  12.   - ``` cd / ```
  13. - Change directory to previous working directory
  14.   - ``` cd - ```
  15. - Change directory to parent directory
  16.   - ``` cd .. ```
  17. - Create to super user root ( Bad Practice )
  18.   - ``` sudo su ```
  19. - To check present working directory
  20.   - ``` pwd ```
  21. - Create file single or multiple
  22.   - ``` touch a.txt b.txt ``` ( It will create two file "a.txt" & "b.txt" in present working directory )
  23. - Create a new copy of "a.txt" as "a_backup.txt"
  24.   - ``` cp a.txt a_backup.txt ``` ( We can also decleare directory with file name. Such as /home/a_backup.txt )
  25. - Create a new copy of "a" folder
  26.   - ``` cp a -r a_backup ``` ( -r Recursively create copy of folder and it's file )
  27. - Delete "a.txt" file
  28.   - ``` rm a.txt ```
  29. - Delete "a" folder
  30.   - ``` rm -r a ``` ( -r Recursively delete folder and it's file )
  31.   - ``` rm -rf a ``` ( f Forcefully delete folder )
  32. - Restore or move a file from another directory to current working directory
  33.   - ``` mv /home/a_backup.txt a.txt ```
  34. - History check
  35.   - ``` history ```
  36. - Storage check
  37.   - ``` df -hT ```
  38. - Free ram or memory check
  39.   - ``` free -mh ```
  40. - Create new user for computer login
  41.   - ``` adduser new_name ```
  42. - Check user list ( Need to be in root directory )
  43.   - ``` cat /etc/passwd ```
  44. - Change password for given username ( If username will not given, it will change current username password )
  45.   - ``` sudo passwd username ```
  46. - It will show the detail of a command
  47.   - ``` man command_name ```  Example: ``` man cat ```
  48. - Delete user and it's file.
  49.   -  ``` sudo userdel -r username ```  ( -r Recursively used for deleting it's file )
  50. - Zipping a file
  51.   - ``` zip to_desired_name.zip from_source_file_name ```
  52. - Unzip file
  53.   - ``` unzip zip_filename```
  54. - Edit "a.txt" file from command line
  55.   - ``` vim a.txt ```
  56.     - Press I for insert or edit
  57.     - Press ``` shift + : ```
  58.     - Then type "wq" & press enter ( w = write & q = quit ) Changes will be saved
  59.     - Then type "q!" ( Forcefully quit ) Changes will not be saved
  60. - To see currently running task
  61.   - ``` top ```
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