nit: while test and [ are binaries, [[ is a bash keyword.
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Another nit, while test and [ are indeed binaries, they are also bash built-ins (for performance, presumably) so bash won’t exec them normally.
True! And for those curious, you can enable disable this shadowing per command, like so:
enable test
enable -n test # disable
enable -n [
command test -f file.txt
Ah, you're right of course. Thank goodness for shellcheck keeping my .sh scripts compatible.