A posix shell script written in 1990s would still work today and likely will work 10 years from now (given that external commands it uses had not breaking chang

A posix shell script written in 1990s would still work today and likely will work 10 years from now (given that external commands it uses had not breaking changes). Not many proper scripting languages have such track record - most of them either had many small backward incompatible changes or an update which breaks many things at once (like Python 2 -> 3). Though I have some 20+ years old Perl scripts which still work today but it is hard to find a language which attracts more haters than Perl.