Check Ports bash script using ss and netstat

chk-port.sh

#!/bin/bash

# NOTES: If ss and netstat return null, the script will say so

# Function to check a specific port using ss
chk-port() {
    if [ -z "$1" ]; then
        echo "Usage: chk-port <port-number>"
        return 1
    fi
    echo "Checking port with ss:"
    output=$(sudo ss -tulpn | grep ":$1")
    if [ -z "$output" ]; then
        echo "Ports not found with ss on port $1."
    else
        echo "$output"
    fi
}

# Function to check a specific port using netstat
chk-port-more() {
    if [ -z "$1" ]; then
        echo "Usage: chk-port-more <port-number>"
        return 1
    fi
    echo "Checking port with netstat:"
    output=$(sudo netstat -tulpn | grep ":$1")
    if [ -z "$output" ]; then
        echo "Ports not found with netstat on port $1."
    else
        echo "$output"
    fi
}

# Check if a port number was provided
if [ -z "$1" ]; then
    echo "Usage: $0 <port-number>"
    exit 1
fi

# Call the functions with the provided port number
chk-port "$1"
chk-port-more "$1"