String Operators | Shell Script

Pre-Requisite: Conditional Statement in Shell Script

There are many operators in Shell Script some of them are discussed based on string.

  • Equal operator (=): This operator is used to check whether two strings are equal.

    Syntax:

    Operands1 = Operand2

    Example:

    #!/bin/sh
      
    str1="GeeksforGeeks";
    str2="geeks";
    if [ $str1 = $str2 ]
    then
        echo "Both string are same";
    else
        echo "Both string are not same";
    fi

    Output:



    Both string are not same
  • Not Equal operator (!=): This operator is used when both operands are not equal.

    Syntax:

    Operands1 != Operands2

    Example:

    #!/bin/sh
      
    str1="GeeksforGeeks";
    str2="geeks";
    if [ $str1 != $str2 ]
    then
        echo "Both string are not same";
    else
        echo "Both string are same";
    fi

    Output:

    Both string are not same
  • Less then (\<): It is a conditional operator and used to check operand1 is less then operand2.

    Syntax:
    Operand1 \< Operand2

    Example:

    #!/bin/sh
      
    str1="GeeksforGeeks";
    str2="Geeks";
    if [ $str1 \< $str2 ]
    then
        echo "$str1 is less then $str2";
    else
        echo "$str1 is not less then $str2";
    fi

    Output:

    GeeksforGeeks is not less then Geeks
  • Greater then (\>): This operator is used to check the operand1 is greater then operand2.

    Syntax:
    Operand1 \> Operand2

    Example:

    #!/bin/sh
      
    str1="GeeksforGeeks";
    str2="Geeks";
    if [ $str1 \> $str2 ]
    then
        echo "$str1 is greater then $str2";
    else
        echo "$str1 is less then $str2";
    fi

    Output:

    GeeksforGeeks is greater then Geeks
  • Check string length greater then 0: This operator is used to check the string is not empty.

    Syntax:



    [ -n Operand ]

    Example:

    #!/bin/sh
      
    str="GeeksforGeeks";
    if [ -n $str ]
    then
        echo "String is not empty";
    else
        echo "String is empty";
    fi

    Output:

    String is not empty
  • Check string length equal to 0: This operator is used to check the string is empty.

    Syntax:

    [ -z Operand ]

    Example:

    #!/bin/sh
      
    str="";
    if [ -z $str ]
    then
        echo "String is empty";
    else
        echo "String is not empty";
    fi

    Output:

    String is empty


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