gre: add different per-protocol prefixes to GRE-TAP IPv4/6 tunnel interfaces.

[openwrt/openwrt.git] / include / shell.sh

diff --git a/include/shell.sh b/include/shell.sh
index 6ee0cf6030ac5e0a71d7be1c2438c58ee9724caf..8f6f6f04bb414e5dc24851d6dceefe8d282782f4 100644 (file)
--- a/include/shell.sh
+++ b/include/shell.sh
@@ -13,3 +13,10 @@ isset() {
        eval "var=\"\${$1}\""
        [ -n "$var" ]
 }
+
+md5s() {
+       cat "$@" | (
+               md5sum 2>/dev/null ||
+               md5
+       ) | awk '{print $1}'
+}