Merge pull request 'Add change hostname script' (#3) from wip into main

Reviewed-on: #3

ReadMe.md

@@ -6,3 +6,4 @@ A collection of scripts intended to simplify setting up and maintianing an Ubunt
 [Docker](Scripts/Docker.sh) - Install Docker  
 [Portainer](Scripts/Portainer.sh) - Install Docker and Portainer Server  
 [Update](Scripts/Update.sh) - Update and clean up unused packages  
+[Change Hostname](Scripts/change_hostname.sh) - Change the hostname for the system

Scripts/USE-AIO.sh

@@ -4,10 +4,11 @@ clear
 echo "What do you want to do?"
 echo "1. Install Docker"
 echo "2. Install Docker + Portainer Server"
-echo "3. Update system"
-echo "4. Exit"
+echo "3. Update System"
+echo "4. Change Hostname"
+echo "5. Exit"
 echo ""
-echo -n "enter your selection: " 
+echo -n "enter your selection(1-4)(5 to exit): " 
 
 while :
 do
@@ -22,32 +23,37 @@ case $choice in
     sudo install -m 0755 -d /etc/apt/keyrings 1>/dev/null 
     sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc 1>/dev/null 
     sudo chmod a+r /etc/apt/keyrings/docker.asc 1>/dev/null 
+
     # Add the repository to Apt sources:
     echo \
     "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
     $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
     sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
     sudo apt-get update 1>/dev/null 
+
     # Install Docker
     sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y 1>/dev/null 
     echo "Done";;
 
-2) echo "Installing Docker..."
+2)  echo "Installing Docker..."
     # Add Docker's official GPG key:
     sudo apt-get update 1>/dev/null 
     sudo apt-get install ca-certificates curl -y 1>/dev/null 
     sudo install -m 0755 -d /etc/apt/keyrings 1>/dev/null 
     sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc 1>/dev/null 
     sudo chmod a+r /etc/apt/keyrings/docker.asc 1>/dev/null 
+
     # Add the repository to Apt sources:
     echo \
     "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
     $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
     sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
     sudo apt-get update 1>/dev/null 
+
     # Install Docker
     sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y 1>/dev/null
     echo "Done"
+
     #install Portianer server
     echo "Installing Portainer..."
     sudo docker volume create portainer_data 1>/dev/null
@@ -64,12 +70,40 @@ case $choice in
     sudo apt-get autoremove -y 1>/dev/null
     echo "Done" ;;
 
-4)  echo "Exiting..."
+4)  echo ""
+
+    #get current hostname and set it as value of old_host
+    old_host=$(hostname)
+
+    #make backups for hostname and hosts files
+    cp /etc/hostname /etc/hostname.bk
+    cp /etc/hosts /etc/hosts.bk
+
+    #ask user for new host name and set it as value for new_host
+    printf "%s\n" "Hostname must be between 1-63 characters long"
+    printf "%s\n" "Valid characters are (lower case a-z), (0-9), and (-)"
+    printf "%s" "enter new hostname:  "
+    read new_host
+
+    #replace old_host with new_host in hostname and hosts files
+    #set hostname to new_host
+    sed -i 's/'$old_host'/'$new_host'/' /etc/hostname
+    sed -i 's/'$old_host'/'$new_host'/' /etc/hosts
+    hostname $new_host
+
+    #confirm change and tell user to restart system
+    printf "%s\n" "Hostname changed from [$old_host] to [$new_host]"
+    printf "%s\n" "Reboot your system for the change to take effect" ;;
+
+5)  echo "Exiting..."
     exit ;;
+
 *)  echo "Invalid option" ;;
 
 esac
 
-echo -n "enter your selection: " 
+echo ""
+echo ""
+echo -n "enter your selection(1-4)(5 to exit): " 
 
 done

Scripts/change_hostname.sh

@@ -0,0 +1,26 @@
+#! /bin/bash
+
+clear
+
+#get current hostname and set it as value of old_host
+old_host=$(hostname)
+
+#make backups for hostname and hosts files
+cp /etc/hostname /etc/hostname.bk
+cp /etc/hosts /etc/hosts.bk
+
+#ask user for new host name and set it as value for new_host
+printf "%s\n" "Hostname must be between 1-63 characters long"
+printf "%s\n" "Valid characters are (lower case a-z), (0-9), and (-)"
+printf "%s" "enter new hostname:  "
+read new_host
+
+#replace old_host with new_host in hostname and hosts files
+#set hostname to new_host
+sed -i 's/'$old_host'/'$new_host'/' /etc/hostname
+sed -i 's/'$old_host'/'$new_host'/' /etc/hosts
+hostname $new_host
+
+#confirm change and tell user to restart system
+printf "%s\n" "Hostname changed from [$old_host] to [$new_host]"
+printf "%s\n" "Reboot your system for the change to take effect"