bash compare numbers

Compare Numbers in Linux Shell Script

• num1 -eq num2 check if 1st number is equal to 2nd number.
• num1 -ge num2 checks if 1st number is greater than or equal to 2nd number.
• num1 -gt num2 checks if 1st number is greater than 2nd number.
• num1 -le num2 checks if 1st number is less than or equal to 2nd number.

1. How do I compare two values in bash?
2. How do I compare two integer variables in bash?
3. What is == in bash?
4. How do you use to compare numbers?
5. Is equal to in bash?
6. What is EQ in Linux?
7. What is unary operator in bash?
8. How do I increment a variable in bash?
9. What is test in bash?
10. What is $1 in bash script?
11. What is option in bash?
12. What is difference between and == in shell script?

How do I compare two values in bash?

Comparison Operators

When comparing strings in Bash you can use the following operators: string1 = string2 and string1 == string2 - The equality operator returns true if the operands are equal. Use the = operator with the test [ command. Use the == operator with the [[ command for pattern matching.

How do I compare two integer variables in bash?

How to Compare Numbers or Integers in Bash

1. 1.1 Check if integers are equal (-eq)
2. 1.2 Compare variables with different numbers using (-ne)
3. 1.3 Compare integer values using (-gt) and (-lt)
4. 1.4 Compare integer values using (-ge) and (-le)

What is == in bash?

It's the other way around: = and == are for string comparisons, -eq is for numeric ones. -eq is in the same family as -lt , -le , -gt , -ge , and -ne , if that helps you remember which is which. == is a bash-ism, by the way. ... In bash the two are equivalent, and in plain sh = is the only one guaranteed to work.

How do you use to compare numbers?

We use comparison symbols (>, < and =) to compare numbers. TIP FOR REMEMBERING! For greater than and less than symbols, the wide open mouth of the symbol always faces the larger number.

Is equal to in bash?

Use == operator with bash if statement to check if two strings are equal. You can also use != to check if two string are not equal. You must use single space before and after the == and !=

What is EQ in Linux?

Checks if the value of two operands are equal or not; if yes, then the condition becomes true. [ $a -eq $b ] is not true. -ne. Checks if the value of two operands are equal or not; if values are not equal, then the condition becomes true. [ $a -ne $b ] is true.

What is unary operator in bash?

Unary operators apply to one argument and are often used to verify the status of a file (e.g. does a specific file exist?). ... At line 5 of our script Bash is expecting a unary operator but the one we are using ( == ) is a binary operator.

How do I increment a variable in bash?

Using + and - Operators

The most simple way to increment/decrement a variable is by using the + and - operators. This method allows you increment/decrement the variable by any value you want.

What is test in bash?

On Unix-like operating systems, test is a builtin command of the Bash shell that tests file attributes, and perform string and arithmetic comparisons.

What is $1 in bash script?

$1 is the first command-line argument passed to the shell script. Also, know as Positional parameters. ... $0 is the name of the script itself (script.sh) $1 is the first argument (filename1) $2 is the second argument (dir1)

What is option in bash?

Options are settings that change shell and/or script behavior. The set command enables options within a script. At the point in the script where you want the options to take effect, use set -o option-name or, in short form, set -option-abbrev. ... #!/bin/bash set -o verbose # Echoes all commands before executing.

What is difference between and == in shell script?

The = isn't even treated as an operator inside the (). Inside the [[ ]] brackets, == is a pattern matching operator for strings, and = is a straight equality comparison. Outside of there, = is an assignment operator like variable="something" and I don't think == does anything.