fix to work from main build directory

xwords4/android/scripts/check-usage.sh

@@ -5,6 +5,8 @@ set -e -u
 # Grabs the list of string names from values.xml and greps for each.
 # If it's not found in a .java or .xml file lists it.
 
+cd $(dirname $0)
+
 IDS=$(./string-names.sh ../XWords4/res/values/strings.xml)
 STR_COUNT=$(echo $IDS | wc -w)
 

xwords4/android/scripts/string-names.sh

@@ -23,6 +23,7 @@ while [ $# -ge 1 ]; do
     shift
 done
 
+[ -n "$FILE" ] || usage "file parameter missing"
 [ -e $FILE ] || usage "File $FILE not found"
 
 xmlstarlet sel -T -t -m "/resources/string" -v @name -n $FILE