Problem Statement

Rename:

This should be done twice:   once "here", i.e. in the current working directory and once in the filesystem root. It can be assumed that the user has the rights to do so. (In unix-type systems, only the user root would have sufficient permissions in the filesystem root.)

Let's start with the solution:

      PROGRAM EX_RENAME
      CALL RENAME('input.txt','output.txt')
      CALL RENAME('docs','mydocs')
      CALL RENAME('/input.txt','/output.txt')
      CALL RENAME('/docs','/mydocs')
      END