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Below is a listing of all commands and a brief description for each.
Add code to the end of a proc.
Add code to the beginning of a proc.
Change value to zero if it is one and vice versa.
Take list and copy values to variables, like lassign.
Print out both the variable name and its value.
Print out the value of each of the variables passed in.
Return zero if passed empty string.
Take variable and make it zero if it is empty.
Swap the values of two variables.
Do upvar if variable exists, else generate error.
Do upvar. If made new variable, then set to default.
Check if variable exists some levels up.