Help with Basic Linux Commands

Hi, can you help me on the following questions? Thanks

1.To search for short descriptions and manual names for the Unix command containing the keyword “chat”, you issue the Unix command:

a)man chat
b)man –k chat
c)man –s chat
d)man –f chat

2.Which of the following are features of the Unix OS?

a)Allow more that one person to communication with the computer.
b)Allow users to share or restrict access to their files.
c)Allow a routine series of Unix commands to be run automatically as shell scripts.
d)All of the above are features of the Unix OS.

3.Assuming that the user is currently in their home directory, which of the following Unix commands will copy the entire contents of the user’s home directory (including subdirectory contents) to a directory called ~/backup?

a)copy ~ ~/backup
b)cp –r ~ ~/backup
c)cp . ~backup
d)Both a and b

4.Which of the following Unix commands will change permissions for all files contained in the directory pathname ~/unx122/samples to allow full permissions for the user, read and execute permissions for group and others?

a)chmod 711 ~/unx122/samples
b)chmod 755 ~/unx122/samples
c)chmod 755 ~/unx122/samples/*
d)chmod 766 ~/unx122/samples

5.Which of the following Unix commands will display lines 3 to 7 of a 10 line file called fun that is contained in your current directory?

a)head –7 fun | tail -5
b)tail –8 fun | head -5
c)both a and b
d)cat fun | head -5

4.A command that could be used to determine if a filename is a directory is:

a)type
b)file
c)dirchk
d)grep

5.When displaying the contents of a text file (while being in “vi” editor), one screen at a time, to find the word "pipe" enter:

a)find pipe
b)/pipe
c)grep pipe
d)next pipe

8.What will happen if the following Unix command is issued:

sort yourfile | tail -25 > abc

a)The last 25 lines (sorted in alphabetical order) will be stored in file abc overwriting the previous file content.
b)The last 25 lines (sorted in alphabetical order) will be appended to file abc.
c)Lines 25 to the bottom of the file will be storeed in file abc.
d)Lines 25 to the bottom of the file will be storeed in file abc, overwriting the old file content

9.The octal number 7325 represents ______________ as a binary number.

a)111011010101
b)111001010100
c)111111010110
d)111000110111

10.Assume that the following Unix commands have just been issued:

$ touch myfile
$ chmod 640 myfile

What are the permissions for the file myfile that was just created?

a)r – x r – x - - -
b)r - - r - - - - -
c)r w x r – x - - -
d)r w – r - - - - -
11.Assuming that you are in the “vi” editor in command mode, which of the following commands will abort the current editing session?

a)Q
b):w
c)ZZ
d):q!

12.Which of the following Unix commands will display all lines in the file called report that begin with 3 numbers?

a)grep “$[0-9][0-9][0-9]” report
b)grep “[1-9][1-9][1-9]$” report
c)grep “^[0-9][0-9][0-9]” report
d)grep “^[^a-zA-Z][^a-zA-Z][^a-zA-Z]” report

13.What does TCP/IP stand for?

a)Transmission Content Packet / Internet Packet
b)Transmission Control Protocol / Internet Protocol
c)Throughput Compression Plan / Improvement Protocol
d)Tracked Connection Probe / Internetworking Probe

14.A shell script can perform the following task(s):

a)Is used to automatically run routine Unix commands.
b)Can be used to configure a user’s environment upon login.
c)Is a file that contains Unix commands to achieve a task.
d)All of the above are tasks performed by a shell script.

15.Which of the following environment variables contains your primary Unix prompt:

a)HOME
b)PWD
c)PROMPT
d)PS1

16.Which of the following environment variables contains your login shell:

a)LOGIN
b)SHELL
c)BASH
d)ENV

EDITOR'S NOTE: Sorry, I don't do homework...