The manual goes like this

PowerISO   Copyright(C) 2004-2008 PowerISO Computing, Inc
Type poweriso -? for help

Usage:    poweriso <command> [parameters] [-switches]

<Commands>

list <image file> <directory>    List files and directories in image file.
Example:  List all files and directories in root direcory of /home/sam/test.iso .
Command:  poweriso list /home/sam/test.iso / -r

extract <image file> <dir/file name>   Extract files/directories from image file.
Example:  Extract all files and directories in root direcory of /home/sam/test.iso
to /home/sam/test recursively.
Command:  poweriso extract /home/sam/test.iso / -od /home/sam/test

convert <image file>    Convert image file to other format.
Example:  Convert /home/sam/test.daa to standard iso file
Command:  poweriso convert /home/sam/test.daa -o /home/sam/test.iso -ot iso

Do take note of the “/” before -od and -r. It throws a weird “Unrecognized parameter:”