The do command available in configuration modes of Cisco IOS is probably one of the best features ever implemented in IOS, but you tend to continue typing the do keyword even in the exec mode, resulting in syntax errors.
Hellz yeah!!! That seems to be my single biggest time-killer (other than my own ignorance and fat fingers). Ivan has created a simple TCL script (he’s the MacGyver of TCL) to allow you to use “do” before commands while in exec mode. I really hope that Cisco implements this functionality in future IOS releases.