Update scripts usage information

scripts/add_manufacturer_to_group_udev.sh

@@ -8,10 +8,10 @@ FILE=
 UDEV_PATH="/etc/udev/rules.d"
 
 usage() {
-  echo "Usage: $0 [-m <manufacturer>] [-g <group>] [-f <file> ]"
-  echo " -m  specify manufacturer  id. For example, Segway"
-  echo " -g  specify group id.         For example, dialout"
-  echo " -f  specify udev file.        Default 99-manufacturer-<manufacturer>-to-group-<group>.rules"
+  echo "Usage: $0 -m <manufacturer> -g <group> [-f <file>]"
+  echo " -m  specify manufacturer id.     For example, Segway"
+  echo " -g  specify group id.            For example, dialout"
+  echo " -f  specify udev file. Optional. Default 99-manufacturer-<manufacturer>-to-group-<group>.rules"
   exit 1
   }
   

scripts/can.sh

@@ -5,9 +5,9 @@ DEVICE=
 NAME=
 
 usage() {
-  echo "Usage: $0 [-d <device>] [-n <name>]"
-  echo " -d  specify device route."
-  echo " -n  specify human friendly device's name."
+  echo "Usage: $0 -d <device> -n <name>"
+  echo " -d  specify device route. For example, /dev/ttyUSB0"
+  echo " -n  specify human friendly device's name. For example, can0"
   exit 1
   }
   

scripts/unbind_ftdi_udev.sh

@@ -9,11 +9,11 @@ FILE="99-ftdi-unbind-by-serial.rules"
 UDEV_PATH="/etc/udev/rules.d"
 
 usage() {
-  echo "Usage: $0 [-v <vendor>] [-p <product>] [-s <serial>] [-f <file> ]"
+  echo "Usage: $0 -v <vendor> -p <product> -s <serial> [-f <file>]"
   echo " -v  specify vendor  id."
   echo " -p  specify product id."
   echo " -s  specify serial number."
-  echo " -f  specify udev file. Default 99-ftdi-unbind-by-serial.rules"
+  echo " -f  specify udev file. Optional. Default 99-ftdi-unbind-by-serial.rules"
   exit 1
   }
   

scripts/undo_unbind_ftdi_udev.sh

@@ -7,9 +7,9 @@ FILE="99-ftdi-unbind-by-serial.rules"
 UDEV_PATH="/etc/udev/rules.d"
 
 usage() {
-  echo "Usage: $0 [-v <vendor>] [-p <product>] [-s <serial>] [-f <file> ]"
+  echo "Usage: $0 -s <serial> [-f <file>]"
   echo " -s  specify serial number."
-  echo " -f  specify udev file.     Default 99-ftdi-unbind-by-serial.rules"
+  echo " -f  specify udev file. Optional. Default 99-ftdi-unbind-by-serial.rules"
   exit 1
   }