bash replace single quotes with double qoutes : I have a directory full of SAS label files. 

The label files have space, single qoute, space, single qoute in each file. 
Looks like, VAR1 = ' 'SOME LABEL' ' 

I want a bash script that will replace these single qoutes with double quotes so that I end up with, VAR1 = "SOME LABEL"

Please help

