Bash Operators

This section provides an overview of operators used in Bash scripting, including comparison, string, arithmetic, logical, and file test operators.

• -eq : Equal to
• -ne : Not equal to
• -lt : Less than
• -le : Less than or equal to
• -gt : Greater than
• -ge : Greater than or equal to

• = : Equal to
• != : Not equal to
• < : Less than, in ASCII alphabetical order
• > : Greater than, in ASCII alphabetical order

• + : Addition
• - : Subtraction
• * : Multiplication
• / : Division
• % : Modulus (remainder of division)
• For exponentiation, use external tools like bc or awk .

• && : Logical AND

• ! : Logical NOT

• -e : Checks if a file exists
• -d : Checks if a directory exists
• -f : Checks if a file is a regular file
• -s : Checks if a file is not empty