Exam XK0-004 topic 1 question 126 discussion

The shebang part should always start with #!/bin.bash

A is correct, /usr/bin/sh is a symbolic link not a file, the syntax can be used with the backtic as shown or $(cat /home/user/iplist.txt) both will work *Tested If the file wasnt executable you would get the error command not found similar issue for D. However if the location that lists the interpreter doesnt have the appropriate file location, you would receive the following error: zsh: ./test.sh: bad interpreter: /usr/bin/sh: no such file or directory I wish CompTIA would fix their questions, include the whole error or dont use the question at all, this question isnt a true test of what you will see in the real world.

A is correct because shebang "MUST" be in the first two bytes at the start of an executable file. https://stackoverflow.com/a/12911604/13282838

I tested this in lab. The correct answer is A assuming the /usr/bin/sh has been deleted, moved or renamed. In my lab I executed the script and it worked. Then I renamed /usr/bin/sh to /usr/bin/sh.old then ran the script again and got the error: "bash: ./test.sh: /usr/bin/sh: bad interpreter: No such file or directory". So as usual CompTIA lied to us when they said "All necessary files exist in the correct locations" because the /usr/bin/sh binary clearly wasn't present from that system they used when writing this question.

If I point to wrong interpreter, I get the message: bash: ./test.sh: /usr/bin/shb: bad interpreter: No such file or directory So, A or The shabang points to the wrong path is the correct answer.

I tested it out using #! /bin/bash; the script does not work. "$" is missing before cat. I vote for B. (Assuming all files exist in the right location might mean that there is an interpreter in the mentioned path ).

The shebang line is the absolute path to the Bash interpreter, and the interpreter usually lives in /bin/bash, so I am going with A.

A is Correct .

All necessary files exist in the correct locations B is the correct answer