Automate Daily with Shell script - Series

This gonna be usefull when U have some pattern actvities to done continously wo/ doing it manually

1. Problem: need to execute `arp -d` continously, the command to delete host on arp table to reset it to first time connect to wifi or other connection gateway. This could even be prevent the user in same connection's gateway which use `internet cut` software (might be myth). Every time the command execute, your computer delete the inet_addr that already chaced to your computer then re-request to gateway point to give you new chace. This usually used when your computer have problem to connect to internet, so your computer need to refresh the chace inet_addr. (I might be wrong sorry, I'm not expert)

#!/bin/bash
echo 'Running command'

set -x #echo on everything the command executed

while true;
do
arp -d
sleep 0.5
done
#saved with <filename>.sh & execute it with your own way

2. start stop get status mongodb in linux 16.04, but make sure you already install mongodb

================
start_mongodb.sh
================
#!/bin/bash

echo 'starting mongo db service'

sudo systemctl start mongodb.service

echo 'done!'

===============
stop_mongodb.sh
===============
#!/bin/bash

echo 'stoping mongo db service'

sudo systemctl stop mongodb.service

echo 'done!'

=================
status_mongodb.sh
=================
#!/bin/bash
mongo --eval "db.stats()"  # do a simple harmless command of some sort

RESULT=$?   # returns 0 if mongo eval succeeds

if [ $RESULT -ne 0 ]; then
    echo "mongodb not running"
    exit 1
else
    echo "mongodb running!"
fi

========================================
FOR WINDOWS user can use this one
========================================
*Note: make sure you already make your MongoDb as a service, to make it as easily install MongoDB compass software, 
it would automatically make it as service or you see here: 
- https://medium.com/stackfame/run-mongodb-as-a-service-in-windows-b0acd3a4b712
- https://stackoverflow.com/a/41073438

================
start_mongodb.sh
================
#!/bin/bash
echo 'Trying to START service MongoDB'

set -x #for echo on
net start MongoDB
echo 'Done START service MongoDB'
sleep 3 #3 secs

===============
stop_mongodb.sh
===============
#!/bin/bash
echo 'Trying to STOP service MongoDB'

set -x #for echo on
net stop MongoDB
echo 'Done STOP service MongoDB'
sleep 3 #3 secs

=================
status_mongodb.sh
=================
for this one you can use script above