disk_check.sh

#!/bin/bash

# Define the check_disk function
# Functions allow you to group code blocks and call them by name later.
check_disk(){
    echo "Disk Usage"
    # df -h /: Shows disk space in human-readable format for the root directory.
    # awk 'NR==2': Processes the second line (skipping the header).
    # {print ...}: Formats and prints specific columns (2, 3, and 4).
    df -h / | awk 'NR==2 {print "  Size: " $2, "Used: " $3, "Available: " $4}'
}

# Define the check_memory function
check_memory(){
    echo "Free Memory"
    # free -h: Shows memory usage in human-readable format (G/M).
    # awk 'NR==2': Focuses on the "Mem:" line.
    # $4 represents the "Free" column in the 'free' command output.
    free -h | awk 'NR==2 {print "  " $4 " free"}'
}

# Main function: This acts as the entry point of your script.
# It controls the execution flow and makes the script cleaner.
main(){
    check_disk
    check_memory
}

# Calling the main function to trigger the logic
main