Syntax:
Showskill spells         - shows a list of all spells
Showskill skills         - shows a list of all skills
Showskill known spells   - shows the list of all your known spells
Showskill known skills   - shows the list of all your known skills
Showskill unknown spells - shows the list of all your unknown spells
Showskill unknown skills - shows the list of all your unknown skills
Showskill <level>        - shows all skills of a given level
Showskill <min lev> <max lev> - Gives a list between the 2 levels
Showskill <name>         - shows skill progression for this skill
Showskill requires <name>  - shows all skills with named skill as a prereq.

The unknown options only reflect skills of your level or lower.

The numbers shown are actual skill level along with any modification to 
that skill currently in affect. 
 
The Skill levels given are in the following order:
Unknown, Novice, Student, Learned, Advanced, Expert, Master
 
Also, every 4th skill/spell is shown highlighted to aid readability.
 
See HELP SKILLS for additional info.