diff options
-rw-r--r-- | netpbm.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/netpbm.c b/netpbm.c index c47cb37e..7f3e7c96 100644 --- a/netpbm.c +++ b/netpbm.c @@ -29,13 +29,17 @@ int main(int argc, char *argv[]) { - char* cp; + const char * cp; if (strcmp(pm_arg0toprogname(argv[0]), "netpbm") == 0) { ++argv; --argc; if (argc < 1 || !*argv) { - fprintf(stderr, "Usage: netpbm netpbm_program_name [args ...]\n"); + fprintf(stderr, + "When you invoke this program by the name 'netpbm', " + "You must supply at least one argument: the name of " + "the Netpbm program to run, e.g. " + "'netpbm pamfile /tmp/myfile.ppm'\n"); exit(1); } } |