Some of the behaviour of //grmlzshrc// can be altered by setting certain shell
variables. These may be set temporarily when starting zsh like this:
\
-``` % BATTERY=1 zsh
+``` % GRML_DISPLAY_BATTERY=1 zsh
Or by setting them permanently in **zshrc.pre** (See AUXILIARY FILES below).
: **BATTERY**
-If set to a value greater than zero and //acpi// installed, //grmlzshrc// will
-put the battery status into the right hand side interactive prompt.
+Deprecated. Use **GRML_DISPLAY_BATTERY** instead.
: **COMMAND_NOT_FOUND**
A non zero value activates a handler, which is called when a command can not
be found. The handler is defined by GRML_ZSH_CNF_HANDLER (see below).
+: **GRML_DISPLAY_BATTERY**
+If set to a value greater than zero, //grmlzshrc// will put the battery status
+into the right hand side interactive prompt. Supported OSes are //GNU/Linux//,
+//FreeBSD//, //OpenBSD// and //Darwin//.
+
: **GRML_ZSH_CNF_HANDLER**
This variable contains the handler to be used by COMMAND_NOT_FOUND (see above)
and defaults to "/usr/share/command-not-found/command-not-found".
: **isdarwin()**
Returns true, if running on darwin, else false.
+: **isfreebsd()**
+Returns true, if running on FreeBSD, else false.
+
: **isgrml()**
Returns true, if running on a grml system, else false.
: **isgrmlsmall()**
Returns true, if run on grml-small, else false.
+: **islinux()**
+Returns true, if running on Linux, else false.
+
: **iso2utf()**
Changes every occurrence of the string iso885915 or ISO885915 in
environment variables to UTF-8.
+: **isopenbsd()**
+Returns true, if running on OpenBSD, else false.
+
: **isutfenv()**
Returns true, if run within an utf environment, else false.
\
```
# show battery status in RPROMPT
-BATTERY=1
+GRML_DISPLAY_BATTERY=1
# always load the complete setup, even for root
GRML_ALWAYS_LOAD_ALL=1
```