1export aaa1="'''" 2export aaa2="" 3export aaa3="'''abc" 4export | grep aaa.= 5 6export -n aaa1 7unset aaa2; export -n aaa2="ghi" 8export -n aaa3="klm" 9export | grep aaa.= 10 11export aaa4=4 aaa5=5 12export -n aaa4=4n 13export -n aaa5 14export | grep aaa.= 15 16export aaa5=5 aaa6=6 aaa7=7 aaa8=8 17export -n aaa5 aaa6=6n aaa7 18export | grep aaa.= 19 20aaa9=9 21export -n aaa9 22set | grep ^aaa9= 23 24export aaa10=10 25export -n aaa10 26set | grep ^aaa10= 27 28 29export EXPORTED=qwe 30export -nnnnnn nnnnnn; echo "Nothing:"; env | grep nnnnnn 31 32export -n EXPORTED=123; echo "Nothing:"; env | grep ^EXPORTED 33 34export EXPORTED=qwe 35export -n EXPORTED; EXPORTED=123; echo "Nothing:"; env | grep ^EXPORTED 36 37echo Done 38