CSCI 57 and 65: Introduction to Unix Courses

Laboratory Assignment 4

ASSIGNMENT DUE: see calendar on the web

• On all homework please include
• Your Name
• Course Number
  
• Date
• ecst login name
  

• This webpage is to be printed from unix and your answers recorded on it.  You must include the printing cover page (details given in lab).
• To print use the command lpr -Pparrot <filename>
• To view the printer queue use the command lpq -Pparrot
• (parrot is the name of the printer in our lab)

• Please answer the following questions (answers and/or help given in lab).  The first 14 questions should be pure review. You should know the answers these ones without having to look them up or think about it by this point.  If you do not know the answers to these questions then you are behind.
  

1. What command is used to create a directory?_______________________________
2. What command is used to remove a directory?______________________________
3. What command is used to remove a file?__________________________________
4. What command is used to rename a file?__________________________________
5. What command is used to move a file?___________________________________
6. What command is used to copy a file?____________________________________
7. What command is used to clear your terminal?______________________________
8. What command is used to create links to files or directories?___________________
9. What command is used to change your password?___________________________
10. What command is used to page output?____________________________________
11. What is a Unix pipe used for?_________________________________________________________________________________________________
12. What command is used to print your present working directory?_________________
13. What is the man command for?__________________________________________
    
14. What does the whatis command do (if you aren't sure type whatis whatis )?________________________________________________
15. What does the cal command do?__________________________________________
16. What is the difference in the last column of output between the who command and the w command?_______________________________________________________________________________
    
17. View a long listing in your HOME directory (type ls -l )  the first  character on each line represents the file type.  For most files it is just a dash '-'
    
• With what character are directories identified by in this column?_____________
• With what character are links identified by?_____________
  
18. Give the chmod command to change permissions on file1 to give:
• Owner - read write execute
• Group - read write
• Other (or world) - read only
• $___________________________________________________________________
19. Give the chmod command to change permissions on file2 to give:
• Owner - read execute
• Group - read execute
• Other - no permissions
• $___________________________________________________________________
20. Give the chmod command to change permissions on file3 to give:
• Owner - read write execute
• Group - read execute
• Other - execute
• $___________________________________________________________________
21. Give the chmod command to add read permission for the group ownership of file4 but without modifying other existing permissions:_____________________________________________________________________________
22. Give the chmod command to modify the permissions on all files ending with the .txt extension in the current directory to (answer should include a wildcard):
• Owner - read write execute
• Group - read write execute
• Other - read execute
• $___________________________________________________________________ 
23. What is your standard file creation mode (type umask to see)?______________________
24. What umask would you use if you wanted all of the files you created to have by default 
• rwx for owner
• rwx for group
• read only for other
• _______________________________________________________
25. In what file would you change your default umask to make this a permanent change?_________________________________
26. A file has the following permissions -rwxr-xr-x  what is the octal value for these permissions (the three numbers)?_______________________
27. A file has the following permissions -rw-r-----  what is the octal value for these permissions (the three numbers)?_______________________
28. A file has the following permissions -r-x-wx--x  what is the octal value for these permissions (the three numbers)?_______________________
29. A file has the following permissions -rwxrwxrwx  what is the octal value for these permissions (the three numbers)?_______________________
30. A file has the following permissions ----------  (no permissions at all)  what is the octal value for these permissions (the three numbers)?_______________________
31. What month and day was /user/s/toddj/somefile.txt  last modified (use a long listing of ls to find out)?___________________________
    
32. What option should you pass to chown to make it operate on files and directories recursively (read the man page, type man chown)?___________
33. What command and option is used on the ECST systems to setup a web directory for your user account?__________________________________
34. After you run this command what new link appears in your HOME directory?_______________________________
35. Where does this link point to (type ls -l to see)?__________________________________________________
36. What happens if you export a senseless path (for example export PATH=blah )?_________________________________________________________
    
37. Create three directories, give one execute permission only, chmod 111 dirname, give another read permission only, chmod 444 dirname, and a third one give read and execute permissions chmod 555 dirname
    
• Try to cd to each one and try an ls -a on each one to see the differences in behavior.
  
• What effect does giving execute permission on a directory have?_________________________________________________________________________________
• What effect does giving read permission on a directory have?____________________________________________________________________________________