EOF
}
-COMMAND=$1; shift
+usage() {
+ cat <<-EOF
+Usage: $0: command (subcommand)
+
+upgrade
+ Run migrations after a package upgrade
+
+ EOF
+}
+
+COMMAND=$1
+
+if [ -z "$COMMAND" ]; then
+ usage
+ exit 0
+fi
+
+shift
case "$COMMAND" in
preinst)
preinst