Networking I
Fall '97
UNIX Review


1.  Match each command below with its correct description by placing the number
    of the description on the blank in front of the command.

    _2__a) cd ..	1)  goes to user's home directory
    _3__b) cd .		2)  goes to parent directory of current directory
    _1__c) cd		3)  goes to current directory

2.  Describe what the commands below have in common and what differences they
    have.
    
    a) cd netclass

go to ./netclass (in the current directory)

    b) cd /home/kcollins/netclass

go to the netclass directory in ~kcollins (/home/kcollins)

    c) cd ~mshibla/netclass

go to the netclass directory in ~mshibla (/home/mshibla)

3.  Describe what each of the commands below will show on the screen when 
    executed from a user's Binx account.

    a) ls -la

long directory listing + filenames beginning with "." (all files)

    b) ls | more

normal directory listing, redirected to a pager

    c) ls *.txt

normal directory listing of files (but not those beginning with ".") ending
in ".txt"

4.  Before the commands below were executed, my directory contained the 
    following:

    file1		class		    file2
    prog.c		main.pas	    file3
    shellscript		public_html	    file4

    Show the contents of my directory after the commands below are executed.

    binx~>mkdir netclass
    binx~>cp file1 netclass
    binx~>mv class.txt grades.txt
    binx~>mv shellscript netclass
    binx~>rm main.pas
    binx~>rmdir netclass

Directory not empty error

    binx~>cat file2 > newfile
    binx~>cat file3 >> newfile

file1		file3
prog.c		file4
grades.txt	netclass
public_html	newfile
file2

5.  A sysadmin is searching for a particular user name (dma) in the password file.
    If each line in the file has the format below, what command will return the
    only line with the desired name?

    dmason:x:1048:1375:Danny Mason:/users/dmason:/bin/csh

grep ^dma: /etc/passwd

6.  Match the file permission with the desired end result.

    _4__a)  Allows only the owner to read, write, and	    1) 777
	    execute					    2) 755
    _5__b)  Allows everyone to read the file, but only the  3) 766
	    owner to write and execute it		    4) 700
    _2__c)  Allows the directory to be accessed by	    5) 744
	    everyone, but not written to by anyone other    6) 666
	    than the owner				    7) 655
    _2__d)  Allows an executable file to be read and run    8) 644
	    by everyone, but only written to by the owner   9) 665
    _10_e)  Allows the owner and the group read and write  10) 664
	    privileges, but the world can only read the    11) 555
	    file					   12) 544

7.  Each of the following scripts was designed to anwswer a quesion.  Determine
    an appropriate question for each.

    a) who | wc -l

How many people are currently logged in?

    b) ps | sort | tail -1

What is the alphabetically last named process I have currently running?

    c) who | sort +4 | tail -1

Who was the person who logged in most recently?

8.  A common problem encountered by those just starting web pages is that a page or
    image is not accessible by anyone other than the creator.  Describe a possible
    reason for this problem.

wrong permissions on the file (700 or such)