Send 1 ping every 20 minutes with human timestamp

ping -i 1200 -D google.ca | while read row; do awk '{ sub(/[0-9]{10}/, strftime("%Y-%m-%d %H:%M:%S", substr($0,2,10))) }1' <<< "$row" ; done

With systemd you can switch from graphical mode to multiuser by typing init 3 as root

or systemctl isolate multi-user.target

If you want to permanently change and save resources

systemctl set-default <name of target>.target

The full list of targets can be accessed with systemctl list-units –type=target

or do

rm /etc/systemd/system/default.target

then do

ln -s /lib/systemd/system/multi-user.target /etc/systemd/system/default.target

when you reboot your machine it should start up with a nice black screen and login:

speedtest-cli
=============

Command line interface for testing internet bandwidth using
speedtest.net

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This will remove the entire line if field 2 contains Apr

awk '$2 !~ /Apr/' Out > Out.temp && rm -f Out && mv Out.temp Out

This will remove the entire line if it begins with Apr.

sed -i '/^Apr./d' OutGoingFiles.txt

Use the following to convert bytes to KB, MB or GB

echo "11714246384" | awk '{ byte = $1 /1024 ; print byte " k";byte = $1 /1024/1024 ; print byte " MB"; byte =$1 /1024/1024**2 ; print byte " GB" }'

Usage: /bin/fail2ban-client [OPTIONS] <COMMAND> Fail2Ban v0.9.1 reads log file that contains password failure report and bans the corresponding IP addresses using firewall rules.

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