2. The Syntax is

3. bc [options]

4. cal COMMAND:

5. cal command is used to display the calendar.

6. SYNTAX:

7. The Syntax is

8. cal [options] [month] [year]

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

11. SYNTAX:

12. The Syntax is

13. cat [OPTIONS] [FILE]...

14. cd COMMAND:

15. cd command is used to change the directory.

16. SYNTAX:

17. The Syntax is

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

19. cp COMMAND:

20. 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).

21. SYNTAX:

22. The Syntax is

23. cp [OPTIONS]... SOURCE DEST

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

26. SYNTAX:

27. The Syntax is

28. echo [options..] [string]

29. grep COMMAND:

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

31. SYNTAX:

32. The Syntax is

34. 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.

35. SYNTAX:

36. The Syntax is

37. last [options]

38. lastlog COMMAND:

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

40. SYNTAX:

41. The Syntax is

42. lastlog [options]

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

46. SYNTAX:

47. The Syntax is

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

50. SYNTAX:

51. The Syntax is

52. sort [options] filename

53. Shutdown COMMAND:

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

55. SYNTAX:

56. The Syntax is

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

60. less - Opposite of the more command

61. clear - Clears the terminal screen.

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

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

64. 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.