Write a set-user-ID-root program similar to the sudo(8) program. This program should take command-line options and arguments as follows:

The douser program executes program-file, with the given arguments, as though it was run by user. (If the –u option is omitted, then user should default to root.) Before executing program-file, douser should request the password for user, authenticate it against the standard password file (see Listing 8-2, on page 164), and then set all of the process user and group IDs to the correct values for that user.

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$ ./douser [-u user 1 program-file argi arg2. ... $ ./douser [-u user 1 program-file argi arg2. ...

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Creating a setuserIDroot program similar to the sudo program involves several steps such as authenticating user credentials setting user and group IDs ... View the full answer