putnamhill

# print value pairs from an array in lower case
jq --raw-output '.[] | "\(.key_1 | ascii_downcase) \(.key_2 | ascii_downcase)"'

# convert `key=value` lines into `{"key":"value"}` json
jq --raw-input 'split("=") | {(.[0]):.[1]}' some.conf | jq --slurp 'add'

# validate json (bad)
echo '{hello: "there"}' | jq . >/dev/null 2>&1 && echo good json || echo bad json
  bad json

putnamhill

#!/usr/bin/perl -w

use Net::CIDR;
use Getopt::Long;

# Net::CIDR one liner:
#   perl -mNet::CIDR -ne 'print if Net::CIDR::cidrlookup($_, ("10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"))'
#
# TODO: add ip address validation

putnamhill

# Use awk to to redirect docker build output to stderr for visual feedback
# while capturing the image id on stdout when the build is sucessfull

ID=$(docker build . | awk '{print > "/dev/stderr"} END {if (/^Successfully built /) print $NF; else exit 1}')

# given docker volume path, return local storage path
doc2loc(){ docker inspect --format "{{range .Mounts}}{{if eq .Destination \"$1\"}}{{.Source}}{{end}}{{end}}" $2;}

putnamhill

#!/bin/bash

agree() {
    local question="$1"
    
    while true; do
        read -p "$question " answer
        case $answer in
            [Yy]|[Yy][Ee][Ss]) return 0 ;;
            [Nn]|[Nn][Oo]|'') return 1 ;; # empty string is default

putnamhill

#!/bin/sh

# sample usage:
#   ontouchdo malformed.html 'clear; xmllint --noout --valid malformed.html 2>&1 | head -n20'
#
# Now fix some things in malformed.html and save. See the remaining errors in real time. Ctrl-c to quit.

[ ! -r "$1" ] && echo 'Nothing to watch.' && exit 1
[ ! -n "$2" ] && echo 'Nothing to do.' && exit 1

putnamhill

configuring opendkim with postfix on ubuntu

Replace example.com with your domain. All occurrences of the string 'mail' are know as the selector and can be any alpha numeric string.

Install opendkim:

$ sudo apt-get install opendkim opendkim-tools

putnamhill

#!/usr/bin/perl

use strict;
use warnings;
use Getopt::Long;
use Digest::MD5;
#use diagnostics;

my $minimum = 0;
my $header = '';

putnamhill

#!/bin/bash

START=$(date +%s)
read -s -n1 -p $'Press a key when done.\n'
ELAPSED_SECONDS=$(bc <<< "scale=10; ($(date +%s) - $START)")
if [ $ELAPSED_SECONDS -gt 60 ]; then
  ELAPSED_MINUTES=$((ELAPSED_SECONDS / 60))
	ELAPSED_SECONDS=$((ELAPSED_SECONDS - ELAPSED_MINUTES * 60))
	echo -n "$ELAPSED_MINUTES minutes "
fi

putnamhill

CREATE USER 'someuser'@'localhost' IDENTIFIED BY 'cleartext-password';
GRANT SELECT,INSERT,UPDATE,DELETE ON `database`.* TO 'someuser'@'localhost';

putnamhill

telnet smtp.example.com 25
    Trying 203.0.113.1...
    Connected to smtp.example.com.
    Escape character is '^]'.
    220 example.com running My Bitchin Mail Server 1.0.0
HELO example.org
    250 example.com hello example.org (198.51.100.1)
MAIL FROM:<postmaster@example.org>
    250 2.1.5 sender OK
RCPT TO:<someone@example.com>