#include #include void main(int argc, char **argv) { char *dir; char *name; int i; dir = nil; ARGBEGIN{ case 'd': if((dir=ARGF()) == nil) goto Usage; break; default: goto Usage; }ARGEND; if(argc < 1) { Usage: fprint(2, "usage: cleanname [-d pwd] name...\n"); exits("usage"); } for(i=0; i