Deck 2: Unix Commands and Functions: Part A

Question 1

The command cal j 1997 would give the output as

A)the calendar of jan, june and july 1997
B)only calendar of jan 1997
C)an error
D)none of the above

Answer 1

an error

Question 2

The output of command banner "Unix shell programming" would be

A)a banner showing 'unix','shell' and 'programming' words displayed in separate lines
B)a banner showing 'unix shell' in one single line
C)nothing
D)a banner showing 'unix shell programming' in one line.

Answer 2

a banner showing 'unix shell' in one single line

Question 3

To see the last access time of various files in a file system the command is

A)is-iu
B)is-i
C)is-acc
D)is-mt

Answer 3

is-iu

Question 4

To ascertain what are the contents of the file in your the system the best way would be

A)do a cat command on each file and find its contents
B)use the command cat*
C)use the command file*
D)none of the above

Question 5

Which of these is not a command of Unix related with DOS

A)dosdir a:proj
B)doscopy trial a:/
C)doscp/home/proj/prg a:/
D)dosls

Question 6

Which of following commands do not belong to multiple file editing commands

A):n!
B):q!
C):rnew!
D)all the above

Question 7

The difference between the commands ps -e and ps -a is

A)ps -e gives details of every process running in memory whereas ps -a gives output for all the process that you have launched
B)ps -e gives details of every process running in memory whereas ps -a gives details of all user processes
C)no difference , both give same output
D)none of the above

Question 8

The father of all processes is

A)root
B)sh
C)sched
D)init

Question 9

The process id numbers of the processes vhand,bdflush,sched and init are

A)1,2,3 and 4
B)2,3,0 and 1
C)3,4,1 and 2
D)0,1,2 and 3

Question 10

Which of the following is not true regarding the command $ nohup cat *.let | nohup sort >f1 &

A)the process would die if the user logs out before the command's execution is over
B)if the user logs out the output of sort would be dtored in a file nohup.out
C)it is optional to give nohup before sort
D)this background process is also known as a deamon process

Question 11

Which of the following is not true regards the kill command

A)super user can kill deamon processes
B)for sure kill the signal no is 9
C)there is no surety that the shell process will get killed by the command kill
D)using kill command you can kill other user's processes too

Question 12

Which of the following is not true

A)the at command permits you to receive messages only by mail
B)a person's login name appears in the file at.allow if he is not allowed to use the at command
C)both are false
D)both are true

Question 13

For a person to receive messages he should have his terminal set to a parameter which will allow him receive messages.The command to set this parameter is

A)message -on
B)msg -o
C)mesg -y
D)message-y

Question 14

The command that unix offers to a user to find out whether he can send messages to a particular terminal are

A)finger and who
B)finger -mesg and who -t
C)finger -i and who -t
D)finger -i and who -t.

Question 15

If the user has read a news item he cannot read it again because of creation of the file

A)_news_time
B)news.time
C).news.time
D).news_time

Question 16

To read the stale news the option available is

A)news -a
B)delete the file /usr/news
C)delete the file _news.time
D)delete the file .news_time

Question 17

The message of the day is stored in a file called

A)/etc/profile
B)/etc/motv
C).profile
D)autoexec.bat

Question 18

The incoming mail of user with the login name aa12 is stored in the file

A)/usr/spool/mail/aa12
B)/usr/aa12/mbox
C)/spool/mail/aa12
D)/usr/aa12/.mbox

Question 19

.mailrc is the file

A)which stores the incoming mail
B)which is used to type the mail to be sent
C)which is invoked when the mail command is executed
D)which permits you to customize the vi environment

Question 20

The escape sequence \033[4m is used to

A)underlying characters
B)mark them as bold
C)display them in reverse video
D)none of the above

Question 21

Which of the following assignments is illegal

A)a='ls'
B)b='ls -l'
C)c='1972'
D)d='who | grepaal'

Question 22

Which of the following assignment is illegal

A)a='cat file'
B)a=100 b=50
C)age=25
D)all the above

Question 23

A null variable a can be created using

A)a=
B)a=''
C)a=""
D)all the above

Question 24

The shell metacharacter $# represents

A)total number of arguments supplied to the shell script
B)total number of files in the current directory
C)total number of users who have logged in
D)total number of processes running in the background

Question 25

When we are executing a shell script the shell acts as

A)an interpreter
B)a compiler
C)an operating system
D)none of the above