timestampit - add a timestamp to command output in Linux

timestampit.sh

#!/bin/bash
# Author: Maxwel Leite
# Website: http://needforbits.wordpress.com/
# Initial Author: Abdullah Diab (http://mpcabd.xyz/adding-a-timestamp-to-command-output-in-linux/)
# Description: Simple bash script to add a timestamp to command output in Linux
#              This is just a quick solution to put a timestamp with each line of the output of some command in Linux.
while read x; do
    # RFC-3339 format - for more accuracy and works with syslog
    echo -n `date --rfc-3339=ns | sed 's/ /T/; s/\(\....\).*-/\1-/g'`;
    echo -n " ";
    echo $x;
done

Usage:
echo "My script for logging" | /usr/bin/timestampit.sh >> /var/log/cron/my_logging.log 2>&1

Sample output:
2017-09-25T15:35:21.808-03:00 My script for logging

Or usage for a cron job:
/path/to/my/command.sh | /usr/bin/timestampit.sh >> /var/log/cron/my_command.log 2>&1

Install:

sudo wget https://gist.githubusercontent.com/maxwelleite/7f63149094a22e75ce6072946acbf3b2/raw/timestampit.sh -O /usr/bin/timestampit.sh
sudo chmod +x /usr/bin/timestampit.sh

Enjoy!