📅  最后修改于: 2022-03-11 14:49:36.781000             🧑  作者: Mango
# Returns true if string empty.
# E.G: file.txt does not exist
EXISTS=$(cat file.txt 2> /dev/null)
if [ -z "${EXISTS}" ]; then
echo "Does not exist"
else
echo "Exist!"
fi
# Output:
# Does not exist