Negate if condition in bash script
You can choose:
if [[ $? -ne 0 ]]; then # -ne: not equalif ! [[ $? -eq 0 ]]; then # -eq: equalif [[ ! $? -eq 0 ]]; then! inverts the return of the following expression, respectively.
Better
if ! wget -q --spider --tries=10 --timeout=20 google.comthen echo 'Sorry you are Offline' exit 1fi
If you're feeling lazy, here's a terse method of handling conditions using || (or) and && (and) after the operation:
wget -q --tries=10 --timeout=20 --spider http://google.com || \{ echo "Sorry you are Offline" && exit 1; }