cli : Display supported formats on -vV command

Requested and inspired by patch from @ib (#771)
2017-08-19 13:33:50 -07:00
parent f7312a7cb4
commit 1c108c811e
6 changed files with 55 additions and 20 deletions
@@ -140,7 +140,9 @@ the last one takes effect.
 * `-h`/`-H`, `--help`:
    display help/long help and exit
 * `-V`, `--version`:
-    display version number and exit
+    display version number and exit.
+    Advanced : `-vV` also displays supported formats.
+    `-vvV` also displays POSIX support.
 * `-v`:
    verbose mode
 * `-q`, `--quiet`: