Bash Substring Verification

Bash provides various mechanisms for working with substrings. Here are some common ways to verify if a substring exists within a string:

1. Using grep command:
   if echo "$string" | grep -q "$substring"; then
echo "Substring found"
else
echo "Substring not found"
fi

2. Using Bash’s built-in pattern matching:
   if [[ $string == *"$substring"* ]]; then
echo "Substring found"
else
echo "Substring not found"
fi

3. Using parameter expansion:
   if [[ "${string/$substring}" != "$string" ]]; then
echo "Substring found"
else
echo "Substring not found"
fi


In all of these examples, replace $string and $substring with the actual string and substring you want to work with.