From: Magnus Jacobsson Date: Sun, 20 Sep 2020 11:23:06 +0000 (+0200) Subject: Add option -? for usage to diffimg X-Git-Tag: 2.46.0~20^2^2~55^2~25 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7c58ee262eedfa290e27f2c0034563d12dd7e925;p=graphviz Add option -? for usage to diffimg --- diff --git a/contrib/diffimg/diffimg.c b/contrib/diffimg/diffimg.c index 12a6cfe68..ca9117911 100644 --- a/contrib/diffimg/diffimg.c +++ b/contrib/diffimg/diffimg.c @@ -164,6 +164,10 @@ int main(int argc, char **argv) FILE *f; #endif + if (argc == 2 && strcmp(argv[1], "-?") == 0) { + fprintf(stderr, "Usage: diffimg image1 image2 [outimage]\n"); + exit(0); + } if (argc < 3) { fprintf(stderr, "Usage: diffimg image1 image2 [outimage]\n"); exit(EX_USAGE);