Usage:
 waitpid [options] PID[:inode]...

Options:
 -v, --verbose           be more verbose
 -t, --timeout=<timeout> wait at most timeout seconds
 -e, --exited            allow exited PIDs
 -c, --count=<count>     number of process exits to wait for

 -h, --help              display this help
 -V, --version           display version

For more details see waitpid(1).