Answers for "bash check if variable contains string"

check if variable contains string bash

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

bash substring test

#!/bin/bash

STR='GNU/Linux is an operating system'
SUB='Linux'
if [[ "$STR" == *"$SUB"* ]]; then
  echo "It's there."
fi

checking if a substring exists in a string bash

string='Haystack';

if [[ $string =~ "Needle" ]]
then
   echo "It's there!"
fi