Errors in shell_adv()

CMDHELPER-2803 - Reported by RobotoRaccoon

Many issues with locating files within directories. These all worked fine in commandline outside of Minecraft.
Was told to submit this in IRC, so apologies for lack of important details, if any.

IOException: Cannot run program "./printSchematics.sh": error=2, No such file or directory
<>:/data/minecraft/1.5-lobby/plugins/CommandHelper/config.txt:311

> shell_adv('./printSchematics.sh')

ShellException: find: `>': No such file or directory
find: `/home/steam/minecraft/SharedServerFiles/Schematics/deliciousfiles.txt': No such file or directory

> shell_adv('find . > /home/steam/minecraft/SharedServerFiles/Schematics/deliciousfiles.txt')

And so on in that fashion for attempts like:
> shell_adv('ls -1 * >dump.txt')