[luatex] Strange behavior for io.popen

Karl Berry karl at freefriends.org
Wed Jun 7 23:44:40 CEST 2017

    'cd' is not a program that can be started in a separated process,

True, but unless something highly unusual is being done,
popen("command") runs sh -c "command", not a direct exec(2) or
similar. (On Unix. Windows is different, obviously.)

So shell builtins can be passed. Same with os.execute -> system(3).  --karl

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