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while true; do
  date -Isec | sed -e 's/+00:00//' | tr '\n' ' '
  pg_isready -h YOUR_RDS_INSTANCE.rds.amazonaws.com -U USER -d DB_NAME
  sleep 1
done | tee connection-test-$(date -Imin).log

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# find the owner of an AWS access key
# https://stackoverflow.com/a/31275655

for user in $(aws iam list-users --output text | awk '{print $NF}'); do
    aws iam list-access-keys --user $user --output text
done

# alternative that uses jq(1) insteaed of awk(1)

for user in $(aws iam list-users --query 'Users[*].UserName' --output text); do

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# Show timestamp for history output
export HISTTIMEFORMAT="%d/%m/%y %T "

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"""Replace 'name' tag with 'Name' and 'application' with 'Application'
"""

import boto3


def uppercaseTagKeys(arn, name, application=None):
    tags = {}
    if name:
        tags['Name'] = name

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# Dockerfile for a multi-stage build of a Ruby app which needs Node at build time
#
# Thanks to https://github.com/gomex for sharing

FROM ruby:2.5.1 as builder

RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - &&\
    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - &&\
    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list

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Don't blame people for changing whitespaces or moving code

git blame will show the author of the last commit that modified the particular line. If whitespaces were removed or that piece of code was moved around, blame will show that commit and you might blame the wrong person.

git blame -w -M

-w will ignore whitespaces and -M will detect moved or copied lines.

Source: https://coderwall.com/p/x8xbnq/git-don-t-blame-people-for-changing-whitespaces-or-moving-code

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{ tail -n +1 -f file.log & } | sed -n '/Initialization finished/q'

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#!/bin/bash
#
# http://stackoverflow.com/a/9256709/31493

trap_with_arg() {
    func="$1" ; shift
    for sig ; do
        trap "$func $sig" "$sig"
    done
}

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# show process start time for a give PID (GNU ps)
ps -o lstart= -p $PID

# show process start time for all processes (GNU ps)
ps ax -O lstart


# show process environment variables (BSD grep)
ps -Eww -p $PID

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# Parse date

# $ pip install python-dateutil
from dateutil import parser
begin = parser.parse("Aug 28 1999 12:00AM")
end = parser.parse("2013-09-11")

# Print duration
delta = end - begin
print str(delta)