Change system+login shell to Dash, add zsh and configuration

programs/powerset/powerset.sh

@@ -1,5 +1,5 @@
-#!/usr/bin/env bash
+#!/bin/sh
 for CPU in $(seq 0 $(($(nproc) - 1))); do
-    echo $1 > /sys/devices/system/cpu/cpu"$CPU"/cpufreq/scaling_governor
+    printf $1 > /sys/devices/system/cpu/cpu"$CPU"/cpufreq/scaling_governor
     cat /sys/devices/system/cpu/cpu"$CPU"/cpufreq/scaling_governor
 done