Linux Questions & Answers on Shell Special Symbols for Freshers

1. The $ variables in a shell script context designates

a) The runtime of the script
b) Number of command line arguments
c) PID of the shell running the script
d) The exit status of the shell script

Answer: c

2. Which variable is used to display number of arguments specified in command line

a) $0
b) $#
c) $*
d) $?

Answer: b

3. Which variable contains last background job process id

a) $*
b) $?
c) $$
d) $!

Answer: d

4. Which command can be used to test various file attributes

a) if
b) file
c) test
d) type

Answer: c

5. * Specifies
a) one or more character
b) zero or more charecter
c) nothing
d) none of the mentioned

Answer: b

6. ? Specifies

a) one or more character
b) zero or more charecter
c) one character
d) none of the mentioned

Answer: c

7. Which of the following file set in the current directory are identified by the regular expression a?b*

a) afcc, aabb
b) aabb, axbc
c) abbb, abxy
d) abcd, axbb

Answer: b

8. What command would send the output of cmd1 to the input of cmd2?

a) cmd1 | cmd2
b) cmd1 || cmd2
c) cmd1 && cmd2
d) cmd1 ; cmd2

Answer: a

9. What is the output of the following command for bash shell:
echo linux $0

a) linux echo
b) linux linux
c) linux bash
d) linux

Answer: c

10. Which variable will display the list of the positional parameters?

a) $#
b) $*
c) $?
d) $$

Answer: b