What is the output of this program?
#!/bin/bash
a=10; b=20
c=$((++a))
let a=c+a
echo $a
exit 0
#!/bin/bash
a=10; b=20
c=$((++a))
let a=c+a
echo $a
exit 0A. 21
B. 22
C. program will generate an error message
D. none of the mentioned
Answer: Option B
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