BASH - Clearing value in a variable

Shell Programming and Scripting
1

anyone has any idae how do i clear the value in a variable in BASH?

So far I come across "Clear-variable", however it can only clear a "Local" and "Global" variable. I'm trying to clear a self-declared variable.

Anyone has any suggestions?

2 
$ a="1234"
$ echo $a
1234
$ unset a
$ echo $a
 
$
3

Thanks jay!

4

You can set it to empty

a="1234"
$echo $a
1234
$ a=
$ echo $a
 
$
5

Thanks for all your response!

But can i check with you guys, is it possible to clear the value in a 2d array with 2 variables as its value? E.g.

${a[$j$i]}