"A collection of pure POSIX sh alternatives to external processes."

"Ternary Tests"

Can anyone point to where in the POSIX standard ternary test are described. (NB. Pure POSIX sh is less featureful than Bash.) What am I missing.

https://web.archive.org/web/20201219013931/https://pubs.open...

Also these operators from C that the author includes. Is he suggesting these are available in POSIX sh.

Quoting from the Pure Sh Bible:

   += Plus-Equal (Increment a variable.)
   -= Minus-Equal (Decrement a variable.)
   *= Times-Equal (Multiply a variable.)
   /= Slash-Equal (Divide a variable.)
   %= Mod-Equal (Remainder of dividing a variable.)

   << Bitwise Left Shift
   <<= Left-Shift-Equal
   >> Bitwise Right Shift
   >>= Right-Shift-Equal
   & Bitwise AND
   &= Bitwise AND-Equal
   | Bitwise OR
   |= Bitwise OR-Equal
   ~ Bitwise NOT
   ^ Bitwise XOR
   ^= Bitwise XOR-Equal

One could probably learn from reading the POSIX standard, the Almquist shell source code and then experimenting. I also like reading other peoples' shell scripts, if they are good. Always something new to learn. Unfortunately this "Bible" did not teach me anything new.