From: alice
> Sent: 13 February 2023 09:24
....
> > The 'test/[' command is almost certainly a shell builtin.
> > The program in /usr/bin is almost never executed.
>
> when one is using busybox ash as a shell, is /usr/bin/test (from busybox
> symlink) and "builtin test" not the same code in the end (same for [)? i.e.
> this case, which is probably using busybox ash (needs confirmation).
On my busbox system [ is a shell builtin and /usr/bin/[ a program.
Both just call stat(filename) for test -r filename.
I don't get a fail for a non-readable directory (but can only
run as root).
Plausibly there is some hackery involved, but putting programs
like 'ash' into busybox probably requires linking them to a .o
and then making most of the symbols static and renaming 'main'.
So it is difficult to share the code for 'test' unless is
is all moved out into a common library.
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT,
UK
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