How do I compare numbers in bash?

Compare Numbers in Linux Shell Script

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

How do I compare three numbers in bash?

Shell script to find greatest of three numbers

1. Get three numbers. Say num1, num2, num2.
2. If (num1 > num2) and (num1 > num3) echo value of num1.
3. elif(num2 > num1) and (num2 > num3) echo value of num2.
4. Otherwise,

How do I compare two integer variables in bash?

So the very first operator to compare two integer type numbers or variables is the “equal to” operator in bash. After login, you need to open the terminal to start making bash files and creating code by “Ctrl+Alt+T”.

How do you do greater than or equal to in bash?

‘>’ Operator: Greater than operator return true if the first operand is greater than the second operand otherwise return false. ‘>=’ Operator: Greater than or equal to operator returns true if first operand is greater than or equal to second operand otherwise returns false.

How do you use greater than in bash?

echo “enter two numbers”; read a b; echo “a=$a”; echo “b=$b”; if [ $a \> $b ]; then echo “a is greater than b”; else echo “b is greater than a”; fi; The problem is that it compares the number from the first digit on, i.e., 9 is bigger than 10, but 1 is greater than 09.

How do you do math in bash?

The Bash shell has a large list of supported arithmetic operators to do math calculations. They work with the let , declare , and arithmetic expansion methods described further below in this post….What are the Bash Arithmetic Operators?

How do you do math in Bash?

What does greater than do in bash?

Greater than or 1 greater than means redirect stdout (standard output, what’s usually written to the terminal. 2 greater than means redirect stderr (standard error). In 2>&1, you are redirecting stderr AND (ampersand) stdout.

How do I add numbers in Bash?

Bash – Adding Two Numbers

1. Using expr command with quotes sum=`expr $num1 + $num2`
2. Use expr command inclosed with brackets and start with dollar symbol. sum=$(expr $num1 + $num2)
3. This is my preferred way to directly with the shell. sum=$(($num1 + $num2))

How to compare numbers in Bash shell scripts?

In Bash shell scripts, we can do a number comparison. To perform a numeric comparison operation in Bash, you must use the “test” state within an if or loop. In this post, we will show you how to compare numbers in bash. Operators for bash number comparison. operator what the example does-eq:

How to test if a number is greater than 20 in Bash?

#!/bin/bash read -p “Enter a number (must be greater than 20) : ” n if test $n -gt 20 then echo “$n is greater than 20.” else echo “You are not following my instructions.”

How to check if a string is arithmetic or not in Bash?

In Bash, you should do your check in an arithmetic context: if (( a > b )); then fi For POSIX shells that don’t support (()), you can use -ltand -gt. if [ “$a” -gt “$b” ]; then fi

What is the Bash calculator command?

The Bash Calculator (bc) command is a basic calculator command. Some more usage examples found hereand here. I don’t know why my example command didn’t work for you though.