In most POSIX compliant shell like
pdksh, when variable assignment occur, field splitting and filename expansion (and brace expansion if the shell supports) are not performed in RHS of assignment:
$ IFS=/ $ a=1/2 # Field splitting and filename expansion turned off here $ b=$a $ IFS= $ printf '%s\n' $b 1/2
Some shell's documentation (bash, ksh) mentioned about this, but POSIX documentation didn't.
I can see this behavior in most POSIX compliant shell, so I wonder is it portable since when POSIX documentation does not specify it?