check if string is not 2 other strings bash code example

Example 1: test string equality bash

strval1="Ubuntu"
strval2="Windows"

#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

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

Example 3: substring if statement variable shell script

if [ $string ?? 'foo' ]; then
  echo "It's there!"
fi