Unix Questions and Answers – Logical Operators and Conditional Execution

This set of Unix Multiple Choice Questions & Answers (MCQs) focuses on “Logical Operators and Conditional Execution”.

1. Which of the following operators are used for logical execution?
a) ||
b) &&
c) %%
d) && and ||
View Answer

command1 && command2
command1 || command2

2. When we use &&, the second command is executed only when first succeeds.
a) True
b) False
View Answer

3. When we use ||, both the commands are executed.
a) True
b) False
View Answer

4. The syntax for using && is ______________
a) cmd1 && cmd2
b) cmd1 cmd2 &&
c) cmd1 & cmd2&
d) cmd1
View Answer

cmd1 && cmd2
cmd1 || cmd2

5. To perform decision depending on the fulfillment of certain criteria, ____ is used.
a) if
b) else
c) for
d) if and else
View Answer

If command is successful
Then
    Execute command
Else
    Execute command
Fi

6. Every if is closed with a corresponding ____
a) else
b) fi
c) if
d) else if
View Answer

7. To check more than two conditions, ___ is used with if-else statements.
a) while
b) for
c) elif
d) for
View Answer

If command is successful
Then
    Execute command
Elif  command is successful
    Then
    Execute command
Else. . .    
Fi

8. The name of the script is stored in which special parameter?
a) $1
b) $0
c) $#
d) $*
View Answer

9. Which of the following is not a special parameter used by the shell?
a) $$
b) $*
c) $?
d) $-
View Answer

        $$ - displays PID of the current shell
        $* - displays the complete set of positional parameters as a single string
        $?  - displays exit status of the last command

10. To know the exit status of a command, we can use ____
a) $$
b) $*
c) $?
d) $-
View Answer

$ grep director.lst  emp.lst  >/dev/null ; echo $?
1                        // success

Sanfoundry Global Education & Learning Series – Unix.

To practice all areas of Unix, here is complete set of 1000+ Multiple Choice Questions and Answers.