indeks string
# To find the index of a substring in another string
# Take for instance, below take two strings: str and substr.
str="hello world"
substr="world"
prefix=${str%%$substr*}
index=${#prefix}
if [[ index -eq ${#str} ]];
then
echo "Substring is not present in string."
else
echo "Index of substring in string : $index"
fi
Mckynde