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

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