Hello, POSIX requires that the 'cd' command use the $HOME environment variable (if that is set) when no operand is given.
It explicitly notes that behavior of 'cd' with no operand when $HOME is unset is implementation defined. It then notes: "A common extension when HOME is undefined is to get the login directory from the user database for the invoking user. This does not occur on System V implementations." I'm surprised that /bin/sh does not use the user's home directory from getpwuid() in that case: $ pwd /tmp $ unset HOME $ cd cd: HOME not set $ pwd /tmp $ This is the same for /bin/ksh and /bin/csh as well. Did all these somehow inherit this from System V or was there a reason why this wasn't implemented? -Jan
