Prashant Patil pskpatil

GNU Make Cheatsheet

Directive	Description
`define variable` `define variable =` `define variable :=` `define variable ::=` `define variable +=` `define variable ?=` `endef`	Define multi-line variables.
`undefine variable`	Undefining variables.

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For symmetic encryption, you can use the following:

To encrypt:

openssl aes-256-cbc -salt -a -e -in plaintext.txt -out encrypted.txt

To decrypt:

	import java.io.BufferedReader;
	import java.io.InputStreamReader;

	public class PingIP {

	public static void runSystemCommand(String command) {

	try {
	Process p = Runtime.getRuntime().exec(command);
	BufferedReader inputStream = new BufferedReader(

	#ifdef SHELL
	g++ -Wall -Werror -g -I../../cclib/rapidjson/include $0 && ./a.out
	exit 0
	#endif

	// Output is:
	// {"project":"rapidjson","stars":11}
	// {"Name":"XYZ","Rollnumer":2,"array":["hello","world"],"Marks":{"Math":"50","Science":"70","English":"50","Social Science":"70"}}
	// {"FromEmail":"[email protected]","FromName":"Sender's name","Subject":"My subject","Recipients":[{"Email":"[email protected]"}],"Text-part":"this is my text"}

	#!/usr/bin/env bash
	set -eu

	# Noddy script to encrypt/decrypt files using openssl private (ssh) key.
	# Works with files and stdin.
	# Results are stdout.
	#
	# Requirements:
	# - openssl
	# - ssh private key: ~/.ssh/id_rsa