* battery_perc battery percentage battery name (BAT0)
* battery_state battery charging state battery name (BAT0)
* cpu_perc cpu usage in percent NULL
- * cpu_iowait cpu iowait in percent NULL
* cpu_freq cpu frequency in MHz NULL
* datetime date and time format string (%F %T)
* disk_free free disk space in GB mountpoint path (/)
* swap_used used swap in GB NULL
* temp temperature in degree celsius sensor file
* (/sys/class/thermal/...)
+ * NULL on OpenBSD
* uid UID of current user NULL
* uptime system uptime NULL
* username username of current user NULL