Basic Commands in RHEL 6.0

Linux Basic Commands

1. ls –l    -->             Listing files & directories include sizes, dates, and other information those  are kept in particular working directory.

2. ls –la  -->     Listing hidden files & directories include sizes, dates, and other information those are kept in particular working directory.

3. ls       -->           Listing only files & directories  those are kept in particular working directory.

4. ls –li   -->          Listing inode number of each and every file.

5. ls –R  -->          Listing a file from its directory and subdirectory.

6. clear  -->          It will clear the screen.

7. ctrl+l -->           It will also clear the screen.

8. exit    -->          To end a current session as well current terminal logging .

9. touch -->          To create a one or more new empty or blank file.

10. cd    -->          To change the working/present directory.

11. cat    -->          To view the contents of a file and it is also used for create a new file and to append the file.

12. mkdir  -->       To make new directory .

13. rm       -->       To remove a file.

14. rmdir  -->        To remove empty a directory.

15. rm [-i/-r/-f]  -->  To remove a directory with its subdirectories as well as its files that is to remove a 

                           directory which already contains some files in it.

      -i                Stands for interactively

      -r               Stands for recursively

      -f               Stands for forcefully            

16. rm –rf    -->    To remove file forcefully.

17. ctrl+c    -->     To kill the application

18. ctrl+z    -->     It will close the running application and application will be running  in the      

                           background and it will utilize RAM space.

19. mv       -->      To move one file or directory from one place to another place, it is also used for

                           renaming a directory or file.

20. man     -->      To view the manual page of commands

21. cp       -->       To copy one or more file from one place to another place.

22. info     -->       To view the information about any command.

23. - -help  -->       To view the help documents of a command.

24. dir       -->       To view the subdirectories and files under the directory.

25. ps      -->         To view process running in the system.

26. su-    -->         To log in become a super user.

27. who  -->         To see the user name who have logged in on your machine along with their terminal

                           no., date and time.

28. whoami  -->    To see your current logged in user name.

29. who am i  -->   To see your current logged in  user name, terminal no., date and time.

30. pwd         -->              To view the present working directory.

31. su username  -->         To switch from one user to another users home directory.

32. su  –  username  -->    To switch from one user to another user users home directory directly.

33. useradd  -->    To create a new user  .

34. passwd  -->      To set password for newly created user or to change the password of existing users.

35. userdel  -->     To delete a user.

36. groupadd   --> To add new group.

37. groupdel   -->  To delete group.

38. chown    -->    To change the ownership of a file or directory.

39. chgrp   -->      To change the group ownership of a file or directory.

40. chmod   -->     To change the permission of a file or directory.

41. usermod  -->   To modify the user profile.

42. which     -->    To determine the full path of a command or alias.

43. df –hT  -->     To see mounted file systems, associated mount points and file system types.    

44. umount  -->    To unmounts a previously mounted file system.

45. date     -->      To view and modify the system date.

46. cal      -->        To view present, past and future year calendar.          

47. history  -->      To show previously running command.

48. head –no.  -->   To view first specific no.’s line from a file.

49. tail –no.  -->    To view last specific no’s line from a file.

50. history | less  -->         To view the commands page wise ( use spacebar to view page wise and up arrow key to line wise)   

51. ! no. from history  -->   To run the command from the history.

52. wc      -->        To view the no.’s lines, character and words in the file.

53. getfacl      -->  To displays the file name, owner, the group, and the Access Control List.

54. setfacl –m  --> To set Access Control List for a user on specific file or directory       .

55. nano       -->     To edit file or create a new file1

56. ctrl+d   -->        To save the contents of the file.

57. mount   -->     To temporary  mounting the device