/media/bill/PROJECTS/System_maintenance/Linux/variable set or unset.txt www.BillHowell.ca 23Oct2019 initial ********** 23Oct2019 https://stackoverflow.com/questions/12262696/using-unset-vs-setting-a-variable-to-empty#26442223 [[ -n $var ]] is false if var is set to the empty string. – chepner Sep 4 '12 at 14:30 # enddoc