+: **is4()**
+Returns true, if zsh version is equal or greater than 4, else false.
+
+: **is41()**
+Returns true, if zsh version is equal or greater than 4.1, else false.
+
+: **is42()**
+Returns true, if zsh version is equal or greater than 4.2, else false.
+
+: **is425()**
+Returns true, if zsh version is equal or greater than 4.2.5, else false.
+
+: **is43()**
+Returns true, if zsh version is equal or greater than 4.3, else false.
+
+: **is433()**
+Returns true, if zsh version is equal or greater than 4.3.3, else false.
+
+: **isdarwin()**
+Returns true, if running on darwin, else false.
+
+: **isgrml()**
+Returns true, if running on a grml system, else false.
+
+: **isgrmlcd()**
+Returns true, if running on a grml system from a live cd, else false.
+
+: **isgrmlsmall()**
+Returns true, if run on grml-small, else false.
+
+: **isutfenv()**
+Returns true, if run within an utf environment, else false.
+
+: **lcheck()**
+Lists libraries that define the symbol containing the string given as
+parameter.
+
+: **limg()**
+Lists images (i. e. files ending with ".jpg", ".gif" or ".png") in current
+directory.
+
+: **mcd()**
+Creates directory including parent directories, if necessary. Then changes
+current working directory to it.
+
+: **mkiso()**
+Creates an iso9660 filesystem image with Rockridge and Joliet extensions
+enabled using mkisofs(8). Prompts the user for volume name, filename and
+target directory.
+
+: **purge()**
+Removes typical temporary files (i. e. files like "*~", ".*~", "#*#", "*.o",
+"a.out", "*.core", "*.cmo", "*.cmi" and ".*.swp") from current directory.
+Asks for confirmation.
+