Short Version

Command	Case
array[${# array[*]}]="$variable"	Indexed at zero
array[${# array[*]}+1]="$variable"	Indexed at one

Explanation

I haven’t found an easier way, but several harder ways to do this. The harder ways often include some sort of loop or creating a new array with the same name and appending the new value to the old values.

References:

• http://www.poundbangwhack.com/2010/02/04/how-to-append-values-to-an-array-in-bash/