Migrate pwgen.py to bash

bash/sources/12_shortcuts

@@ -17,3 +17,17 @@ function kres {
 		kubectl get $1 -A $_O | grep "$_D*$2$_D*\s\+$_D*$3$_D*"
 	fi
 }
+
+function pwgen {
+	local _LEN=$1
+	case $_LEN in
+		''|*[!0-9]*)
+			echo "Enter a valid number" > /dev/stderr
+			return 1
+			;;
+	esac
+	LC_ALL=C tr -dc '[:graph:]' </dev/urandom | head -c $_LEN
+	if [ -t 1 ]; then
+		echo
+	fi
+}