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Also noteworthy, this post of mine with authoritative text from GNU docs. Read "(Un)Portable Shell Programming" https://news.ycombinator.com/item?id=31678176 h

• interroboink 4y ago
  Or, as Larry Wall put it, "It is easier to port a shell than a shell script."
  • kazinator 4y ago
    That was no idle musing; he had in mind a reversal of the situation. He put that into action by making a language so embroiled in its own implementation that cloning a new version would be a pointless exercise in failing to replicate the internal details of the original program. That nicely solved the problem of it being hard to port a script. Then he made it incredibly hard to build. Cross-compiling it wasn't even a thing, and probably still isn't; we just use distro builds that have Qemu.