opterr 98 usr/include/unistd.h extern int opterr; opterr 35 usr/lib/libc/stdlib/getopt.c int opterr = 1, /* if error message should be printed */ opterr 81 usr/lib/libc/stdlib/getopt.c if (opterr && *ostr != ':') opterr 100 usr/lib/libc/stdlib/getopt.c if (opterr)