#!/bin/bash   a=10; b=20   c=$&#40;&#40;++a&#41;&#41;   let a=c+a   echo $a   exit 0
A. 21
B. 22
C. program will generate an error message
D. none of the above
Answer:A
#!/bin/bash   a=10; b=20   c=$&#40;&#40;++a&#41;&#41;   let a=c+a   echo $a   exit 0
A. 21 B. 22 C. program will generate an error message D. none of the above
Explanation:None.