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Adds a hostname to a given IP address in /etc/hosts.
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#!/usr/bin/env bash | |
# The MIT License (MIT) | |
# | |
# Copyright (c) 2023 Christian Haintz | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining a copy of | |
# this software and associated documentation files (the "Software"), to deal in | |
# the Software without restriction, including without limitation the rights to | |
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | |
# the Software, and to permit persons to whom the Software is furnished to do so, | |
# subject to the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be included in all | |
# copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | |
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | |
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
############################################################### | |
# Adds a hostname to a given IP address. # | |
# Doesn't add a new line if IP is already present # | |
# # | |
# Usage: add_hostname_to_hosts.sh <ip_address> <hostname> # | |
############################################################### | |
# Check if the script is run with root privileges | |
if [ "$(id -u)" -ne 0 ]; then | |
echo "This script must be run as root or with sudo." | |
exit 1 | |
fi | |
# Check if the correct number of arguments is provided | |
if [ $# -ne 2 ]; then | |
echo "Usage: $0 <IP_ADDRESS> <HOSTNAME>" | |
exit 1 | |
fi | |
IP_ADDRESS="$1" | |
HOSTNAME="$2" | |
HOSTS_FILE="/etc/hosts" | |
# Check if the IP address is already present in the hosts file | |
IP_EXISTS=$(grep -w "$IP_ADDRESS" "$HOSTS_FILE") | |
if [ -z "$IP_EXISTS" ]; then | |
# Add the IP address and hostname to the hosts file | |
echo "$IP_ADDRESS $HOSTNAME" >> "$HOSTS_FILE" | |
echo "Added $IP_ADDRESS $HOSTNAME to $HOSTS_FILE." | |
else | |
# Check if the hostname is already present for the IP address | |
HOSTNAME_EXISTS=$(echo "$IP_EXISTS" | grep -w "$HOSTNAME") | |
if [ -z "$HOSTNAME_EXISTS" ]; then | |
# Add the hostname to the existing IP address entry | |
TEMP_FILE=$(mktemp) | |
sed "/$IP_ADDRESS/s/$/ $HOSTNAME/" "$HOSTS_FILE" > "$TEMP_FILE" | |
cat "$TEMP_FILE" > "$HOSTS_FILE" | |
rm "$TEMP_FILE" | |
echo "Added $HOSTNAME to the existing IP address entry in $HOSTS_FILE." | |
else | |
echo "The hostname $HOSTNAME is already present for the IP address $IP_ADDRESS in $HOSTS_FILE." | |
fi | |
fi |
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