Rename --use_hex to --hex

This is much more common on unix systems, and I end up typing it by
accident most of the time.  And it is shorter too.

Change-Id: I8e4bbc186a8a82c7546d74e161c145825f0c4c0f
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/aos/aos_cli_utils.cc b/aos/aos_cli_utils.cc
index b930af5..a4ea95e 100644
--- a/aos/aos_cli_utils.cc
+++ b/aos/aos_cli_utils.cc
@@ -228,7 +228,7 @@
   aos::FlatbufferToJson(
       builder, channel->schema(), static_cast<const uint8_t *>(context.data),
       {options.pretty, static_cast<size_t>(options.max_vector_size),
-       options.pretty_max, options.use_hex});
+       options.pretty_max, options.hex});
 
   if (options.json) {
     std::cout << "{";
diff --git a/aos/aos_cli_utils.h b/aos/aos_cli_utils.h
index 9082188..35fb61f 100644
--- a/aos/aos_cli_utils.h
+++ b/aos/aos_cli_utils.h
@@ -23,7 +23,7 @@
   // Print the distributed clock.
   bool distributed_clock;
   // Print numbers out in hex.
-  bool use_hex;
+  bool hex;
 };
 
 // Print the flatbuffer out to stdout, both to remove the unnecessary cruft from
diff --git a/aos/aos_dump.cc b/aos/aos_dump.cc
index 573a06c..b76b1a3 100644
--- a/aos/aos_dump.cc
+++ b/aos/aos_dump.cc
@@ -27,7 +27,7 @@
 DEFINE_int32(timeout, -1,
              "The max time in milliseconds to wait for messages before "
              "exiting.  -1 means forever, 0 means don't wait.");
-DEFINE_bool(use_hex, false,
+DEFINE_bool(hex, false,
             "Are integers in the messages printed in hex notation.");
 
 int main(int argc, char **argv) {
@@ -63,7 +63,7 @@
           .print_timestamps = FLAGS_print_timestamps,
           .json = FLAGS_json,
           .distributed_clock = false,
-          .use_hex = FLAGS_use_hex,
+          .hex = FLAGS_hex,
       },
       /*flush*/ true);
 
diff --git a/aos/events/logging/log_cat.cc b/aos/events/logging/log_cat.cc
index da061ed..a2441c8 100644
--- a/aos/events/logging/log_cat.cc
+++ b/aos/events/logging/log_cat.cc
@@ -59,7 +59,7 @@
 DEFINE_double(monotonic_end_time, 0.0,
               "If set, only print messages sent at or before this many seconds "
               "after epoch.");
-DEFINE_bool(use_hex, false,
+DEFINE_bool(hex, false,
             "Are integers in the messages printed in hex notation.");
 
 using aos::monotonic_clock;
@@ -390,7 +390,7 @@
           .print_timestamps = FLAGS_print_timestamps,
           .json = FLAGS_json,
           .distributed_clock = FLAGS_distributed_clock,
-          .use_hex = FLAGS_use_hex,
+          .hex = FLAGS_hex,
       },
       false);