Advanced bash

I will be sampling a few bash code snippets that will include some advanced bash scripting techniques.

Sample One: Password Base64 Decoding

This sample script take a Base64 encoded password string and decode it to a plain text password.

#!/bin/bash

# This script decodes a Base64 encoded password string to a plain text password

# Define the password string
password_string="cGFzc3dvcmQ="

# Decode the password string
password=$(echo $password_string | base64 -d)

# Print the decoded password
echo $password

Sample Two: Ping Multiple IPs

This sample script takes a list of IP addresses and pings them to check if they are alive.

#!/bin/bash

# This script takes a list of IP addresses and pings them to check if they are alive

# Define the list of IP addresses
ips=("192.168.1.1" "192.168.1.2" "192.168.1.3")

# Loop through the list of IP addresses
for ip in "${ips[@]}"; do
    # Ping the IP address
    ping -c 1 $ip
    # Check the exit status of the ping command
    if [ $? -eq 0 ]; then
        echo "$ip is alive"
    else
        echo "$ip is not alive"
    fi
done

Sample Three: Project folder creation

This sample will automate the creation of your project directory structure and it's files.

#!/bin/bash 
# This script will automate the creation of your project directory structure and it's files

# Define the project name
project_name="my-project"

# Define the project directory
project_dir="$HOME/projects/$project_name"

# Create the project directory
mkdir -p $project_dir

project_files=(README.md, LICENSE, CONTRIBUTING.md, CODE_OF_CONDUCT.md, SECURITY.md)

# Loop through the project files
for file in "${project_files[@]}"; do
    # Create the file in the project directory
    touch $project_dir/$file
    # Add some content to the file
    echo "This is a sample content for $file" >> $project_dir/$file
done

Sample Four: Password Generator

This sample will automate the creation of a password generator script.

#!/bin/bash

# This script will generate a random password

# Define the length of the password
echo "Enter the length of the password:"
read -r password_length

# Generate a random password

if [ $password_length -lt 8 ]; then
    echo "Password length must be at least 8"
    exit 1
else
    password=$(openssl rand -base64 $((password_length * 3/4)) | cut -c 1-$password_length)
fi

# Print the generated password
echo "Generated password: $password"