How to check if a string contains a substring in Bash

This below example will show you, how to check if a string contains a substring in the bash script.

str="How are you"

if [[ $str = *you* ]]; then
  echo "it's found"
fi

#output--> it's found

In the above code, we have used wild card character * to find a substring in the given str.

If your substring contains spaces you need to add double quotes with the * character.

str="How are you"

if [[ $str = *"are you"* ]]; then
  echo "it's found"
fi

# output--> it's found