Unix world, pipe is used frquently. Here is an example for the web-spell-checker from Wikipedia
And while we're there, for the benefit of the OP, we may remind that while on the one hand this is one of the things that can make shell programming very powerful, there are generally better ways to "combine perl scripts" (or better, code) within Perl, where, "better" of course depends on the situation, and is in the eye of the beholder. Just to prevent the system 'this|that|thatother' (a.k.a. shell scripting in Perl) syndrome, you know!
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