=== modified file 'mandos-keygen'
--- mandos-keygen	2017-08-20 13:54:01 +0000
+++ mandos-keygen	2017-08-20 14:08:59 +0000
@@ -161,8 +161,8 @@
 	[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|*) FORCE=0;;
     esac
     
-    if [ \( -e "$SECKEYFILE" -o -e "$PUBKEYFILE" \) \
-	-a "$FORCE" -eq 0 ]; then
+    if { [ -e "$SECKEYFILE" ] || [ -e "$PUBKEYFILE" ]; } \
+	&& [ "$FORCE" -eq 0 ]; then
 	echo "Refusing to overwrite old key files; use --force" >&2
 	exit 1
     fi

=== modified file 'network-hooks.d/bridge'
--- network-hooks.d/bridge	2012-06-13 22:06:57 +0000
+++ network-hooks.d/bridge	2017-08-20 14:08:59 +0000
@@ -29,7 +29,7 @@
     . "$CONFIG"
 fi
 
-if [ -z "$BRIDGE" -o -z "$PORT_ADDRESSES" ]; then
+if [ -z "$BRIDGE" ] || [ -z "$PORT_ADDRESSES" ]; then
     exit
 fi