Jeff M lovejavaee

S/MIME Encrypted Email Example with Gmail and Comodo

A quick how-to installation for secure S/MIME installation for a Gmail account on macOS. This certificate can be used to simultaneously encrypt and sign emails.

Obtain and install an S/MIME Certificate

Create a unique revocation passphrase in a password manager—long, random, unique.
Browse to Comodo and request a free, secure email certificate:

Enter your name, email address, and specify the maximum 2048 bit length
Enter your revocation passphrase in case your private key is ever stolen or compromised

Installing Kafka on Mac OS X

Install Homebrew

Homebrew is a great little package manager for OS X. If you haven't already, installing it is pretty easy:

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

Revert the full commit

Sometimes you may want to undo a whole commit with all changes. Instead of going through all the changes manually, you can simply tell git to revert a commit, which does not even have to be the last one. Reverting a commit means to create a new commit that undoes all changes that were made in the bad commit. Just like above, the bad commit remains there, but it no longer affects the the current master and any future commits on top of it.

git revert {commit_id}

About History Rewriting

Delete the last commit

Deleting the last commit is the easiest case. Let's say we have a remote origin with branch master that currently points to commit dd61ab32. We want to remove the top commit. Translated to git terminology, we want to force the master branch of the origin remote repository to the parent of dd61ab32:

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

	某个时刻的实时qps监控：
	tail /var/log/nginx/2012-08-25-taobao-access_log -f --pid=19139\|grep "`date +%Y:%m:%d:%T`"\|wc -l;
	统计10秒中的总qps：
	tail /var/log/nginx/2012-08-25-taobao-access_log -f -s 10 --pid=19139\|wc -l
	统计10秒中的平均qps：
	echo "`/var/log/nginx/2012-08-25-taobao-access_log -f -s 10 --pid=19139\|wc -l`/10"\|bc

	package com.googletwo.jdmall.util;

	import java.util.regex.Pattern;

	/**
	* 校验器：利用正则表达式校验邮箱、手机号等
	* @author along
	* @time 2016/7/10 13:49
	* @desc ${TODD}
	*/

	package com.ck.server;

	import io.netty.bootstrap.ServerBootstrap;
	import io.netty.channel.ChannelFuture;
	import io.netty.channel.ChannelInitializer;
	import io.netty.channel.ChannelOption;
	import io.netty.channel.EventLoopGroup;
	import io.netty.channel.FixedRecvByteBufAllocator;
	import io.netty.channel.nio.NioEventLoopGroup;
	import io.netty.channel.socket.SocketChannel;

	import org.apache.http.Header;
	import org.apache.http.HttpEntity;
	import org.apache.http.HttpResponse;
	import org.apache.http.client.methods.HttpGet;
	import org.apache.http.client.methods.HttpPost;
	import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
	import org.apache.http.impl.client.CloseableHttpClient;
	import org.apache.http.impl.client.HttpClients;
	import org.apache.http.ssl.SSLContextBuilder;

	#!/bin/bash

	sudo yum update -y

	sudo yum install -y netstat git rubygems gcc kernel-devel make perl
	sudo yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel maven

	sudo gem install sass

	cd /tmp

	SPC s c remove highlight

	**** Files manipulations key bindings
	Files manipulation commands (start with ~f~):

	\| Key Binding \| Description \|
	\|-------------+----------------------------------------------------------------\|
	\| ~SPC f c~ \| copy current file to a different location \|
	\| ~SPC f C d~ \| convert file from unix to dos encoding \|
	\| ~SPC f C u~ \| convert file from dos to unix encoding \|