Does anybody know of a KSH command or some code that I can call that
checks read, write, execute permissions on a directory for a particular
user without having to login and actually doing the above-mentioned
actions.

For example I am looking for something like this, which will return a
TRUE or FALSE

IsGroupReadable("directory name", "group name")
IsUserWriteable("directory name", "user name")
IsUserExecutable("directory name", user name")

Thanks in advance to all who reply