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:

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

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  Output:

  
  
  
  

  Both string are not same

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

  Syntax:

  Operands1 != Operands2

  Example:

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

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  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:

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  #!/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

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  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:

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

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  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:

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

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  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:

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

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  Output:

  String is empty

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