Debian || script to change hostname,IP config and sourcelist

[DerMeldos]

#!/bin/bash

# Function to replace text in a file
replace_in_file() {
    local file="$1"
    local search="$2"
    local replace="$3"
    sed -i "s|$search|$replace|g" "$file"
}

# Initialize variables to store the changes
network_changes=""
sources_list_changed=false
hostname_changes=""

# 1. Edit network configuration
echo "Please enter the new IP address for ens18:"
read new_ip
echo "Please enter the new gateway address:"
read new_gateway
echo "Please enter the new nameserver address:"
read new_nameserver

network_changes+="iface ens18 inet dhcp -> iface ens18 inet static"$'\n'
network_changes+="address xxx -> address $new_ip"$'\n'
network_changes+="gateway xxx -> gateway $new_gateway"$'\n'
network_changes+="nameserver xxx -> nameserver $new_nameserver"$'\n'

# Backup the original interfaces file
cp /etc/network/interfaces /etc/network/interfaces.bak

# Update the network configuration
cat > /etc/network/interfaces << EOF
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug ens18
iface ens18 inet static
        address $new_ip
        gateway $new_gateway
        nameserver $new_nameserver
EOF

# 2. Edit sources.list
sources_list_changes="# deb cdrom:[Debian GNU/Linux 11.2.0 _Bullseye_ - Official amd64 DVD Binary-1 20211218-11:13]/ bullseye contrib main"
sources_list_changes+="\ndeb [trusted=yes] http://deb.debian.org/debian/ bullseye main"
sources_list_changes+="\ndeb-src [trusted=yes] http://deb.debian.org/debian/ bullseye main"
sources_list_changes+="\ndeb [trusted=yes] http://security.debian.org/debian-security bullseye-security main contrib"
sources_list_changes+="\ndeb-src [trusted=yes] http://security.debian.org/debian-security bullseye-security main contrib"
sources_list_changes+="\ndeb [trusted=yes] http://deb.debian.org/debian/ bullseye-updates main contrib"
sources_list_changes+="\ndeb-src [trusted=yes] http://deb.debian.org/debian/ bullseye-updates main contrib"

# Check if changes were made to the sources.list
if ! cmp -s /etc/apt/sources.list <(echo "$sources_list_changes"); then
    sources_list_changed=true
fi

# Apply the changes to the sources.list
echo "$sources_list_changes" > /etc/apt/sources.list

# 3. Edit hostname and hosts file
echo "Please enter the new hostname for the machine (e.g., server1):"
read new_hostname

hostname_changes+="New hostname: $new_hostname"$'\n'
hostnamectl set-hostname "$new_hostname"
replace_in_file "/etc/hosts" "127.0.1.1.*" "127.0.1.1\t$new_hostname"

# Summary of changes
echo -e "Summary of changes:\n"
echo -e "Network configuration changes:"
echo -e "$network_changes"

if $sources_list_changed; then
    echo "Sources.list changed."
fi

echo -e "Hostname change:"
echo -e "$hostname_changes"

# Confirmation prompt
echo -n "Do you want to reboot the system now? (Y/N): "
read reboot_choice

if [[ $reboot_choice =~ ^[Yy]$ ]]; then
    echo "Rebooting the system..."
    reboot
else
    echo "Changes have been applied. You may need to reboot the system for all changes to take effect."
fi

[DerMeldos]

Script migrated to Github to add functionality more easily.

https://github.com/DerMeldos/WEIGEL-Script-Collection/blob/main/vm-config-edit.sh