Suspends the execution of the current process (or thread in a
    threaded program) for at least the number of seconds indicated by
    its argument.

    Format

      #include  <unistd.h>

      unsigned int sleep  (unsigned seconds); (_DECC_V4_SOURCE)

      int sleep  (unsigned seconds); (not _DECC_V4_SOURCE)

  Additional Information (explode) :

• Argument
• Description
• Return Values