enable Weekly Email Notification from the Trusted Advisor.

1) Open the AWS Management Console.
2) Go to the Trusted Advisor service.
3) Select Preferences from the sub-navigation.
4) Enable weekly email notifications.

from functools import partialmethod
pd.DataFrame.head = partialmethod(pd.DataFrame.head, n=3)

apt-get update && apt-get upgrade
mkdir -p /usr/share/man/man1
apt-get install default-jdk
apt install openjdk-11-jdk

1. Open the AWS SNS Management Console
2. Create and select a SNS topic

3. Click on Actions > Subscribe to Topic

4. Choose HTTPS as the protocol and set the endpint to:
   api.marbot.io

5. Configure your CloudWatch Alarms to send notifications to the SNS topic.

lsblk prints all block devices in a tree-like format.

lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 8G 0 disk
└─xvda1 202:1 0 8G 0 part /
xvdf 202:80 0 90G 0 disk

If file command on the disk identifier "xvdf" shows simply "data", then there is no file system on the device and you need to create one.

file -s /dev/xvdf
/dev/xvdf: data

The total file size of the Food-5K dataset is about 1.16 GB. Here are steps to download food 11 dataset.

mmspg.epfl.ch

Use these commands at linux prompt:

ftp
open tremplin.epfl.ch
FoodImage@grebvm2.epfl.ch
Cahc1moo
get Food-11.zip

Cron entry to remove all files in /home/ folder that starts with 'bk_all_dbProdSlave' and not created in the last 2 days.

59 22 find /home/ -name bkall_dbProdSlave\ -mtime +2 -exec rm -f {} \;

Similar as above to remove compressed files:

find /home -type f ( -name ".sql.gz" -o -name ".tar.gz" -mtime +10 ) -exec rm -rf {} \;

List of important Types in Amazon Cloud Formation tool:

IAM (User, Group, Policy, AccessKey, Role)
Athena (NamedQuery)
Route53 (RecordSetGroup)
EC2 (SecurityGroup::Id, KeyPair::KeyName, SpotFleet)
Lambda (Function, Permission)
Events (Rule)
ApiGateway (RestApi, Method, Deployment)
Logs (LogGroup)

Standard codes used for classification:
1 SC
2 OBC
3 SBC
4 VJNT
5 ST
6 OPEN
7 Orphan

Here are 8 important concepts of Shell scripting that everyone should know.

1) Exit Code Status $?
2) here_doc
3) if_else

if [[ $mystatus = 'No' ]];then
echo "slave down"
else
echo "slave ok"
fi

4) For loop

for i in ls
do
cp $path$i $new_path
done

5) Positional Parameters $1, $2, $#, $@

6) Variables

7) Functions
stop()
(
for socket in {2..9}
do
mysqladmin shutdown $socket
done
)

8) Globbing - t?est [ab] [a-c] [^ab] {b,c,test*}