This console command will increase the specified skill by one point.
incpcs [actor value id]
| Actor Value ID | The actor value ID (skill ID) of the skill you wish to advance. |
IncPCS Alteration
The above command would increase your character's Alteration skill by one level.
IncrementPCSkill
This command does the same as the IncPCS command - it is an alias (longer version).