2. bc command is used for command line calculator. It is similar to basic calculator. By using which we can do basic mathematical calculations.

3. SYNTAX:

4. The Syntax is

5. bc [options]

6. cal COMMAND:

7. cal command is used to display the calendar.

8. SYNTAX:

9. The Syntax is

10. cal [options] [month] [year]

12. cat linux command concatenates files and print it on the standard output.

13. SYNTAX:

14. The Syntax is

15. cat [OPTIONS] [FILE]...

16. cd COMMAND:

17. cd command is used to change the directory.

18. SYNTAX:

19. The Syntax is

20. cd [directory | ~ | ./ | ../ | - ]

21. cp COMMAND:

22. cp command copy files from one location to another. If the destination is an existing file, then the file is overwritten; if the destination is an existing directory, the file is copied into the directory (the directory is not overwritten).

23. SYNTAX:

24. The Syntax is

25. cp [OPTIONS]... SOURCE DEST

27. echo command prints the given input string to standard output.

28. SYNTAX:

29. The Syntax is

30. echo [options..] [string]

31. grep COMMAND:

32. grep command selects and prints the lines from a file which matches a given string or pattern.

33. SYNTAX:

34. The Syntax is

35. grep [options] pattern [file]

37. last command is used to display the last logged in users list. Last logged in users informations are read from the file /var/log/wtmp.

38. SYNTAX:

39. The Syntax is

40. last [options]

41. lastlog COMMAND:

42. lastlog command is used to print the last login times for system accounts. Login information is read from the file /var/log/lastlog.

43. SYNTAX:

44. The Syntax is

45. lastlog [options]

48. rm linux command is used to remove/delete the file from the directory.

49. SYNTAX:

50. The Syntax is

51. rm [options..] [file | directory]

53. sort command is used to sort the lines in a text file.

54. SYNTAX:

55. The Syntax is

56. sort [options] filename

57. Shutdown COMMAND:

58. Shutdown - Turn off the computer immediately or at a specified time.

59. SYNTAX:

60. The Syntax is

61. /sbin/shutdown [-t sec] [-arkhncfFHP] time [warning-message]

64. less - Opposite of the more command

65. clear - Clears the terminal screen.

66. cmp file1 file2 - Compares two files, reporting all discrepancies. Similar to the diff command, though the output format differs.

67. wc filename --- tells you how many lines, words, and characters there are in a file

68. whoami --- returns your username. Sounds useless, but isn't. You may need to find out who it is who forgot to log out somewhere, and make sure *you* have logged out.