If you are writing a bash script and you want to increment a counter variable, below are five ways in which you can do it.
Option 1: Using += operator
#!/bin/bash
counter_variable=0
((counter_variable+=1))
echo $counter_variable
Output:
Option 2: Using let command
#!/bin/bash
counter_variable=0
let "counter_variable=counter_variable+1"
echo $counter_variable
Output:
Option 3: Using arithmetic expansion
#!/bin/bash
counter_variable=2
((counter_variable++))
echo $counter_variable
Output:
Option 4: Using expr command
#!/bin/bash
counter_variable=5
counter=$(expr $counter_variable + 1)
echo $counter_variable
Output:
Option 5: Using (( )) construct
#!/bin/bash
counter_variable=9
((counter_variable++))
echo $counter_variable
Output:
Facing issues? Have Questions? Post them here! I am happy to answer!
Author Info:
Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
Follow him on: X
You can also reach out to him via e-mail: rakesh@code2care.org
More Posts related to Bash,
- How to use Autocomplete and Autosuggestion in Shell Commands
- Bash How to Save Output of a Command to a Variable
- How to know the current shell you are logged in?
- How to Echo Bash Command to a File
- Bash Command to Get Absolute Path for a File
- How to Split a String based on Delimiter in Bash Scripting
- Bash: Command Line Arguments to Bash Script Examples
- Bash Command to Download a File From URL
- How to check if a Command Exists using Bash Script
- Ways to Increment a counter variable in Bash Script
- Know Bash shell version command
- Bash command to Read, Output and Manipulate JSON File
- Bash Command to Base64 Decode a String
- Bash Command to Check Python Version
- Bash: Command to Find the Length of a String
- What is $$ in Bash Shell Script- Special Variable
- Bash - How to check if a Command Failed?
- List all Username and User ID using Bash Command
- Command to Sort File In Reverse Order [Unix/Linux/macOS]
- bash: netstat: command not found
- Bash Command To Go Back To Previous Directory
- [Fix] bash: script.sh: /bin/bash^M: bad interpreter: No such file or directory
- How to check your IP using bash for Windows?
- Bash Command To Check If File Exists
- Convert String from uppercase to lowercase in Bash
More Posts:
- How to get SharePoint Online user details from person or group column using REST API - SharePoint
- 31: Python Program to reverse a String - Python
- Let us try to answer why we need Genetics in Java? - Java
- Fix: error: mismatched closing delimiter } [Rust] - Rust
- Excel Fix: SECURITY RISK Microsoft has blocked macros from running because the source of this file is untrusted. - JavaScript
- Understanding AWS Calculator: DynamoDB on-demand capacity - AWS
- JDBCTemplate Querying Examples with Spring Boot 3 - Java
- Sort a List using Java 8 Stream Examples - Java