Operating systems written in Pascal are now obsolete. OSs in C are not.
Perl is much easier to replace because fewer things were dependent on it however even here Perl 5.x still pops up all over the place.
Run "file /usr/bin/* | grep -i perl | wc -l" on your computer. You will be surprised.
EDIT: if you want a histogram for all the types of programs in your system, run this
file -bL /usr/bin/* | cut -d' ' -f1-3 | sort | uniq -c | sort
Operating systems written in Pascal are now obsolete. OSs in C are not.
Perl is much easier to replace because fewer things were dependent on it however even here Perl 5.x still pops up all over the place.