IFS Input field separator and Array in bash
By default, in bash we have IFS set as space(' ') What we will learn What exactly is Input Field Separator Create arrays in bash Access arrays in shell Get length of array What exactly is Input Field Separator Input Field Seperator Create Arrays from String in Shell To create a array from a shell: IFS= ' ' input= "coffee is hot, water is cold" array=( $input ) echo "len: " ${array[@]} Check if String contains a substring if [[ ! " $str " =~ "~" ]] ; then echo "It contains there!" fi Check if String contains a substring OR AND another string if [[ " $str " =~ ":" || " $str " =~ "~" ]]; then echo "Its there!" fi