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Maybe! It depends.

If any member of the exec family of functions succeeds, it replaces the current process image with a new executable process. There is no return from that new image because the...

Did you notice the $2 that I marked in red in your script? Do you see that the test is looking for a file named by the 2nd command-line argument passed to your script?

What happens if you change...

Exactly what you think it is. You have it a bit backwards, I think - sem_wait is what's responsible for making threads sleep. If the resource is busy, sem_wait makes you sleep, if the resource is...

the numbers appear twice because there're 2 &-s separated by www.
echo "123 abc" | sed 's/[0-9]*/& www &/'

Like RudiC mentioned, x=$1 Assigns the value of the first parameter with which the script is called to variable x
After this there are 5 iterations that add a number to variable x
So in the end...

That obviously is a (bourne) shell function. As you don't mention your shell's version, bash assumed.

man bash:During expansion, the "multiword character" of $1 is lost, and the shell makes up...