Mdu	du.c	/^main(argc, argv)$/
err	du.c	/^err(fmt, va_alist)$/
getbsize	../../bin/df/getbsize.c	/^getbsize(prog, headerlenp, blocksizep)$/
linkchk	du.c	/^linkchk(p)$/
usage	du.c	/^usage()$/
