Rajendarreddy Jagapathi rajendarreddyj

When configuring Apache Tomcat, you can use multiple mechanisms to set JVM parameters, system properties, and environment variables. Each has a specific role and scope.

#Catalina Options (CATALINA_OPTS)

✅ Purpose:

Used for setting JVM options specific to Tomcat runtime (startup and shutdown).
Typically configured in setenv.sh (Linux/macOS) or setenv.bat (Windows).

✅ Common Uses:

Install Tomcat as a service on Linux

Download Tomcat from the Apache website.
Unpack in /opt/apache-tomcat-x.y.z. E.g. /opt/apache-tomcat-8.5.6.
You'll need a terminal and root access.

Create Tomcat user with restricted permissions

How to create a new user and remove the `pi` user on a Raspberry Pi

Note: This has been tested in Rasbian Buster released on 2019-06-20

Important: replace jeremy below with whatever username you'd like as your new user.

sudo adduser jeremy
- You will be asked to enter a password
- When filling out basic information about the user, you may leave it blank

Use curl to get the JSON response for the latest release
Use grep to find the line containing file URL
Use cut and tr to extract the URL
Use wget to download it

curl -s https://api.github.com/repos/jgm/pandoc/releases/latest \
| grep "browser_download_url.*deb" \
| cut -d : -f 2,3 \
| tr -d \" \

Creating the patch

git format-patch -1 <sha>
OR
git format-patch -1 HEAD

Applying the patch

git apply --stat file.patch # show stats.
git apply --check file.patch # check for error before applying

How to setup mount / auto-mount USB Hard Drive on Raspberry Pi

Follow the simple steps in the order mentioned below to have your USB drive mounted on your Raspberry Pi every time you boot it.

These steps are required especially if your are setting up a Samba share, or a 24x7 torrent downloader, or alike where your Raspberry Pi must have your external storage already mounted and ready for access by the services / daemons.

Step 0. Plug in your USB HDD / Drive to Raspberry Pi If you are using a NTFS formatted drive, install the following

	FROM mcr.microsoft.com/windows:1903 AS build

	WORKDIR C:\\odtsetup
	ADD https://download.microsoft.com/download/2/7/A/27AF1BE6-DD20-4CB4-B154-EBAB8A7D4A7E/officedeploymenttool_11617-33601.exe odtsetup.exe
	RUN odtsetup.exe /quiet /norestart /extract:C:\\odtsetup

	FROM mcr.microsoft.com/windows:1903 AS download

	WORKDIR C:\\odtsetup
	COPY --from=build C:\\odtsetup\\setup.exe .

	# This contains two lines (#4, #7) which will be run as an encoded PowerShell command inside a Visual Basic Script (VBScript) scheduled task below.

	# Check if 'updateJDK.vbs' is already running in another process; if so, let's quit and just let that finish the task
	Get-Process -Name 'WScript' \| foreach{if($_.CommandLine -imatch 'updateJDK.vbs' -and $_.Id -ne $PID){ exit } }

	# We will update the %JAVA_HOME% path upon observing discrepency between the newest available JDK (local directory) and the %JAVA_HOME%
	$jdk = Get-ChildItem (Resolve-Path 'C:\Program Files\AdoptOpenJDK\') -Depth 0 -Directory \| Sort-Object -Property LastWriteTime -Descending \| Select-Object -First 1; if(($null -ne ([System.Environment]::GetEnvironmentVariable('JAVA_HOME'))) -and ($env:JAVA_HOME -ne $jdk)) { [System.Environment]::SetEnvironmentVariable('JAVA_HOME',$($jdk.FullName),[System.EnvironmentVariableTarget]::User) }

	# Whenever we change the script (i.e., the above line of PowerShell commands), we generate the new encoded command

	================================
	The GeoJSON Format Specification
	================================

	:Abstract:
	GeoJSON is a geospatial data interchange format based on JavaScript Object
	Notation (JSON).

	:Authors:
	Howard Butler (Hobu Inc.),

	<!DOCTYPE html>
	<html>
	<head>
	<title>Simple polygon visualisation</title>
	<meta charset="utf-8" />
	<script src="http://cdn.leafletjs.com/leaflet-0.6.1/leaflet.js"></script>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<style>
	@import url(http://cdn.leafletjs.com/leaflet-0.6.1/leaflet.css);
	</style>