The following are commonly used commands on UNIX operating systems such
as OMEGA.  Use the 'man' command for additional information if necessary.

1.  passwd     -- to change a password

2.  ^d         -- to log out

3.  cat X.c    -- display the contents of a file named X.c

4.  man        -- to get online help

5.  help       -- to get online help

6.  dxbook     -- to get online help

7.  cat X.c Y.c > Z.c  -- to concatenate Y.c onto the end of X.c and save
                           the result as a file named Z.c

8.  more X.c   -- displays a page of X.c at a time

9.  less X.c   -- displays a page of X.c at a time, but can also

                     -- type 'b' to scroll backward one screen

                     -- type 'f' to scroll forward one screen (or press the

                     -- type 'q' to quit displaying the file and return to
                         the system prompt

10. head -7 X.c  -- display the first 7 lines of the file X.c

11. tail -3 X.c  -- display the last 3 lines of the file X.c

12. >         -- redirects standard output

13. >>     -- redirects and appends standard output

14. >&        -- redirects standard output and standard error

15. >>&    -- redirects and appends standard output and standard error

16. <         -- redirects standard input

17. <<XXX  -- reads input up to a line identical with XXX

18. |            -- redirects standard output to another command ("pipe")

19. ls           -- list on the screen

20. rm X.c       -- remove the file X.c from the current subdirectory

21. cp X.c Z.c   -- copy the contents of X.c to a new file Z.c, or replace
                     the contents of an existing Z.c with the contents of

22. mv X.c Z.c   -- move (rename) the file X.c with the name Z.c

23. wc           -- display the number of lines, words, and characters in a file

24. cmp X.c Z.c  -- compare X.c and Z.c for any differences and report the
                     first difference found

25. diff X.c Z.c -- report all of the differences found between X.c and Z.c

26. grep ABC X.c -- search for the string ABC in X.c

27. sort X.c     -- sort the lines of X.c and display the sorted output

28. pwd          -- display the path to the current subdirectory

29. cd           -- change directory

30. mkdir ABC    -- make a new subdirectory called ABC

31. rmdir ABC    -- remove the existing subdirectory ABC

32. vi X.c       -- begin editing X.c with the vi editor

33. history      -- display the last 20 commands (20 by default)

34. alias        -- used for making a nickname or abbreviation for a UNIX

25. cal June 2005 -- display the calendar for June of 2005

26. date         -- display the current date as an ASCII text string

27. who          -- display all users currently logged on

Updated 04.18.06.