It is often written:
/usr/bin/testis a synonym for/usr/bin/[[[is a bash improvement for[testand[are also builtins
I understand the difference between [ and [[ but I am confused with the binary vs. builtin relationship here. What is really used in my scripts when I use [ or [[ if /usr/bin/test and /usr/bin/[ are also present in my system?
In the manpage for test, there is missing the often-used option -a, which is listed in help test. I would guess [ is used as a builtin, if this option works.
