Building Programs

$($a$)$ Explain the concept of the "shebang" $("$#$!")$at the start of script files for in$-$

terpreted languages.

$($b$)$ A developer writes a script in bash called printodd to extract and print the

odd pages of a PDF file. All the commands have been tested at the command

prompt and are known to execute as expected. The commands are placed in a

file after a line which reads

#$!/$bin$/$bash

but when the developer types $./$printodd the program doesn't run and the

following is displayed:

bash: $./$printodd: Permission denied

Explain what is wrong and how to correct it$.$

Scrutinise the following Makefile:

$($Line numbers are for reference only and are not part of the code$).$ The files in the

directory prior to the first attempt at compilation are as follows: