add bashutils

bashutils

@@ -0,0 +1,16 @@
+#!/hint/bash
+
+function shasum {
+	command shasum <<<"$1" | awk '{ print $1 }'
+}
+
+# once <command>
+function once {
+	local flagname="__onceflag_$(shasum "$*")"
+	if [[ -z ${!flagname} ]]; then
+		declare -g "${flagname}"=1
+		"$@"
+	fi
+}
+
+