Linux Bash Arithmetic Expressions Question:
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What is the output of this program?
If:
1) #!/bin/bash
2) a=2
3) b=4
4) let c=a**b
5) echo $c
6) exit 0

Options:
a) 8
b) 16
c) 32
d) none of the mentioned

Answer:

b) 16

Explanation:
'**' is the exponentation operator in bash shell.
Output:
root@ubuntu:/home/google#./test.sh
16
root@ubuntu:/home/google#

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Which one of the following is not a valid operator in bash shell?
a) ||
b) ~
c) =<<
d) -=		What is the output of this program?
#!/bin/bash
a=10; b=20
c=$((++a))
let a=c+a
echo $a
exit 0
a) 21
b) 22
c) program will generate an error message
d) none of the above