Simple Calculator - Bash Typing CST Test

Mode:

Duration:

add() { echo $(( $1 + $2 )); }
subtract() { echo $(( $1 - $2 )); }
multiply() { echo $(( $1 * $2 )); }
divide() { echo $(( $1 / $2 )); }

echo "Add 5 + 3: $(add 5 3)"
echo "Subtract 5 - 3: $(subtract 5 3)"
echo "Multiply 5 * 3: $(multiply 5 3)"
echo "Divide 6 / 2: $(divide 6 2)"Coding works best on desktop or with an external keyboard.

Simple Calculator — Bash Code

Performs basic arithmetic operations using functions.

add() { echo $(( $1 + $2 )); }
subtract() { echo $(( $1 - $2 )); }
multiply() { echo $(( $1 * $2 )); }
divide() { echo $(( $1 / $2 )); }

echo "Add 5 + 3: $(add 5 3)"
echo "Subtract 5 - 3: $(subtract 5 3)"
echo "Multiply 5 * 3: $(multiply 5 3)"
echo "Divide 6 / 2: $(divide 6 2)"

Bash Language Guide

Bash (Bourne Again SHell) is a Unix shell and command language widely used for automation, scripting, DevOps, system administration, and shell-based application workflows. It is the default shell on most Linux systems and offers powerful command-line capabilities.

Primary Use Cases

▸System automation
▸Server maintenance scripts
▸DevOps & CI/CD pipelines
▸File management & text processing
▸Docker and container orchestration
▸Environment setup
▸Scheduling cronjobs

Notable Features

▸Unix pipelines
▸Command substitution
▸Scripting with loops & conditionals
▸Environment variable management
▸Job control & process management

Origin & Creator

Created by Brian Fox at the Free Software Foundation in 1989 as a free replacement for the Bourne Shell (sh).

Industrial Note

Bash excels in environments requiring quick system automation, CI/CD pipelines, container orchestration scripts, server automation, cloud provisioning scripts, and Unix-level glue code that ties together native tools.

Quick Explain

▸Bash is both a command-line shell and a scripting language.
▸It automates system tasks, file operations, pipelines, and CLI tools.
▸Commonly used in Linux, macOS, servers, DevOps, and container environments.

Core Features

▸Shell built-ins
▸POSIX-compatible scripting
▸Pattern matching (globbing)
▸Redirection & piping
▸Command substitution with $()
▸Signal handling (trap)

Learning Path

▸Learn shell basics
▸Master file operations
▸Understand pipes & redirects
▸Learn scripting fundamentals
▸Build automation pipelines

Practical Examples

▸Backup automation script
▸Log parser using grep/awk/sed
▸Server health monitoring tool
▸CI deploy script
▸Docker build+push automation

Comparisons

▸Simpler than Python for automation
▸More portable than PowerShell on Linux
▸Weaker data structures vs Perl
▸More universal than zsh
▸Better scripting integration than Fish

Strengths

▸Installed nearly everywhere
▸Perfect for automation
▸Integrates with all Unix tools
▸Simple for small scripts
▸Ideal for CI/CD and DevOps

Limitations

▸Not suitable for large-scale applications
▸Weak type system
▸Difficult debugging
▸Portability issues across shells
▸Limited data structures

When NOT to Use

▸Large-scale applications
▸Complex data structures
▸Cross-platform GUIs
▸High-performance computing
▸Math-heavy workloads

Cheat Sheet

▸Shebang: #!/usr/bin/env bash
▸Debug: set -x
▸Arrays: arr=(a b c)
▸Loop: for f in *; do ...; done
▸Check exit code: if [[ $? -ne 0 ]]; then

FAQ

▸Is Bash still relevant?
▸Yes-used in DevOps, Linux servers, CI/CD, and automation.
▸Is Bash fast?
▸Fast for system tasks; slow for computation-heavy workloads.
▸Is Bash hard?
▸Simple for small scripts; tricky with complex logic.
▸Is Bash cross-platform?
▸Works on Linux/macOS; limited on Windows without WSL.

30-Day Skill Plan

▸Week 1: Commands, pipes, redirection
▸Week 2: Variables, loops, functions
▸Week 3: Text processing (awk/sed)
▸Week 4: Build real automation scripts

Final Summary

▸Bash is the universal automation language of Unix systems.
▸Perfect for DevOps, scripting, CI/CD, and system-level tasks.
▸Powerful when combined with Unix tools like grep, sed, and awk.
▸Lightweight, portable, and indispensable on servers.

Project Structure

▸scripts/ folder
▸main.sh entrypoint
▸utils/ helper scripts
▸config.env
▸logs/ output logs

Monetization

▸DevOps engineering
▸Cloud automation roles
▸System administration
▸Infrastructure scripting services

Productivity Tips

▸Use aliases
▸Use set -x to debug
▸Leverage pipes heavily
▸Combine awk/sed/grep effectively

Basic Concepts

▸Variables & environment vars
▸Loops & conditionals
▸Functions & arguments
▸File operations & pipes
▸Exit codes & error handling

Official Docs

▸GNU Bash Manual
▸Advanced Bash Scripting Guide
▸man bash

More Bash Typing Exercises

Bash Counter and Theme Toggle Bash Factorial Bash Fibonacci Sequence Bash Array Comprehension Simulation Bash String Manipulation Bash Loop and Conditional Bash Functions with Arguments Bash Sum of Array Bash Zip Simulation

Practice Other Languages

C React Python C++Rust TypeScript Kotlin PHP Java C#Ruby Mql Cql N1ql Cypher

add() { echo $(( $1 + $2 )); }
subtract() { echo $(( $1 - $2 )); }
multiply() { echo $(( $1 * $2 )); }
divide() { echo $(( $1 / $2 )); }

echo "Add 5 + 3: $(add 5 3)"
echo "Subtract 5 - 3: $(subtract 5 3)"
echo "Multiply 5 * 3: $(multiply 5 3)"
echo "Divide 6 / 2: $(divide 6 2)"

Coding works best on desktop or with an external keyboard.

Simple Calculator — Bash Code

Performs basic arithmetic operations using functions.

add() { echo $(( $1 + $2 )); } subtract() { echo $(( $1 - $2 )); } multiply() { echo $(( $1 * $2 )); } divide() { echo $(( $1 / $2 )); } echo "Add 5 + 3: $(add 5 3)" echo "Subtract 5 - 3: $(subtract 5 3)" echo "Multiply 5 * 3: $(multiply 5 3)" echo "Divide 6 / 2: $(divide 6 2)"

Bash Language Guide

Primary Use Cases

▸System automation
▸Server maintenance scripts
▸DevOps & CI/CD pipelines
▸File management & text processing
▸Docker and container orchestration
▸Environment setup
▸Scheduling cronjobs

Notable Features

▸Unix pipelines
▸Command substitution
▸Scripting with loops & conditionals
▸Environment variable management
▸Job control & process management

Origin & Creator

Created by Brian Fox at the Free Software Foundation in 1989 as a free replacement for the Bourne Shell (sh).

Industrial Note