Lets encrypt - Add multiple domains to one certificate

 It's very simple, just use the following command to generate the certificate with as many domains as needed (two in the below example):

certbot certonly --webroot -w /var/www/html/easybiny/price -d price.easybiny.com -d www.price.easybiny.com

Integrate sendmail Linux EC2 and AWS SES

 1. Configure AWS SES Service as per instructions below:

https://docs.aws.amazon.com/ses/latest/DeveloperGuide/send-email-set-up.html

2. Install sendmail

sudo yum install sendmail

sudo yum install m4

sudo yum install sendmail-cf

3. Follow the below steps from AWS:

https://docs.aws.amazon.com/ses/latest/dg/send-email-sendmail.html

4. Test by running the following command:

echo "Subject: sendmail test" | sendmail -f sender@domain.com  -v destination@domain.com

Linux - See Top memory consumers

1. Simple way to do it is to run following command:

top -o %MEM

2. Output below

[root@ip-x-x-x-x xinetd.d]# top -o %MEM
top - 15:24:13 up  8:02,  1 user,  load average: 0.01, 0.31, 0.25
Tasks: 107 total,   1 running,  66 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.2 sy,  0.0 ni, 99.3 id,  0.3 wa,  0.0 hi,  0.0 si,  0.2 st
KiB Mem :   472500 total,   227492 free,   185308 used,    59700 buff/cache
KiB Swap:        0 total,        0 free,        0 used.   274136 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 2275 mysql     20   0 1771192  65264      0 S   0.0 13.8   0:09.53 mysqld
 1384 root      20   0   65632  12376  12000 S   0.0  2.6   0:00.66 systemd-journal
 2833 apache    20   0 1923848  10644    152 S   0.0  2.3   0:05.61 httpd
 2572 apache    20   0 2050504   9232    108 S   0.0  2.0   0:05.78 httpd
 2571 apache    20   0 1921608   9196     72 S   0.3  1.9   0:05.60 httpd
 2573 apache    20   0 1917128   8064     88 S   0.0  1.7   0:05.63 httpd
 2258 root      20   0  398704   7360    896 S   0.0  1.6   0:01.19 httpd 

3. As per above, we can see that mysql process is the top memory eater. 

Install Telnet on AWS Linux 2 Server

 1. 

yum -y install telnet

2. 

yum clean all

3. 

rm -rf /var/cache/yum

4. Test:

[root@ip-x-x-x-x xinetd.d]# telnet
telnet>

Free Mac OS X Windows Management Tool - Productivity app

Spectacle is for me an easy to use Tool which instantly increased my Productivity.

Steps do to the same for you:

 1. Download the tool from here:

https://www.spectacleapp.com/

2. Follow the easy straight forward steps to install.

3. You're done. My favorite one is 3 window screen split:

How to use bash For Loop In One Line

Just enter below command and will get the magic - below runs your-script.sh 5 times:

for i in {1..5}; do echo "------------------------ Iteration ".$i."    ----------------------"; sh your-script.sh;sleep 3; done

Schedule send email - Online Web Version Outlook O365

Yes - this is finally true. You can now schedule emails to be sent at a specific time from online Outlook.

Very happy to have this feature, it was requested for some time to be available.

You now get the following option when sending a new message - Send Later:

Choose the date and time you want the message to be sent:

Optionally, you can double check that message appears under Draft Folder with the proper scheduled note: