<P> It is an external command, graphically displays the path of each directory and sub-directories on the specified drive . </P> <P> The TRUENAME command will expand the name of a file, directory, or drive, and display the result . It will expand an abbreviated form which the command processor can recognise into its full form . It can see through SUBST and JOIN to find the actual directory . </P> <P> MS - DOS can find files and directories given their names, without full path information, if the search object is on a path specified by the environment variable PATH . For example, if PATH includes C: \ PROGRAMS, and file MYPROG. EXE is on this directory, then if MYPROG is typed at the command prompt, the command processor will execute C: \ PROGRAMS \ MYPROG. EXE . In this case, </P> <P> This command displays the UNC pathnames of mapped network or local CD drives . This command is an undocumented DOS command . The help switch "/?" defines it as a "Reserved command name". It is available in MS - DOS 5.00. 0 . This command is similar to the Unix which command, which, given an executable found in $PATH, would give a full path and name . The C library function realpath performs this function . The Microsoft Windows command processors do not support this command . <real code.st> </P>

Which of these is a type of external dos command