Bash - check if number is equal

In this article, we would like to show you how to check if number is equal to another number in Bash.

In this example, we use -eq operator to check if number is equal to another number inside if statement.

script.sh file:

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#!/bin/bash

​

number=5

​

if [ "$number" -eq 5 ]; then

    echo "$number is equal to 5"

fi

Note: this approach should be used in POSIX shells where other solutions may not work.

Run in command line:

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./script.sh

Output:

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5 is equal to 5

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#!/bin/bash

​

number=5

​

if test "$number" -eq 5; then

    echo "$number is equal to 5"

fi

Note: [ ] notation is shorthand of test command.

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#!/bin/bash

​

number=5

​

if [[ "$number" -eq 5 ]]; then

    echo "$number is equal to 5"

fi

Note: [[ ]] notation is like extended test command, adding additional features (e.g. regular expressions).

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#!/bin/bash

​

number=5

​

if (( "$number" == 5 )); then

    echo "$number is equal to 5"

fi

Note: (( )) notation was created to simplyfy conditions (like in C language).

1. Bash - compare number variable to another number