bash check if in string code example

Example 1: check if variable contains string bash

STRING='Hello world'
if [[ $STRING =~ "Hello" ]] ; then echo "It's here" ; fi

Example 2: check string in bash

#Check equality two string variables

if [ $strval1 == $strval2 ]; then
  echo "Strings are equal"
else
  echo "Strings are not equal"
fi

#Check equality of a variable with a string value

if [ $strval1 == "Ubuntu" ]; then
  echo "Linux operating system"
else
  echo "Windows operating system"
fi