Linux OS Shell Question: Download Linux Shell PDF

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

c) linux bash

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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	When the return value of any function is not specified within the function, what function returns? a) nothing b) exit status of the last command executed c) 0 d) none of the mentioned