View jq-snippets.sh
# convert `key=value` lines into `{"key":"value"}` json
jq --raw-input 'split("=") | {(.[0]):.[1]}' some.conf | jq --slurp 'add'
View prvate-ip.pl
#!/usr/bin/perl -w
use Net::CIDR;
use Getopt::Long;
# Net::CIDR one liner:
# perl -mNet::CIDR -ne 'print if Net::CIDR::cidrlookup($_, ("10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"))'
#
# TODO: add ip address validation
View docker-snippets.sh
# Use awk to to redirect docker build output to stderr for visual feedback
# while capturing the image id on stdout when the build is sucessfull
ID=$(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;}
View docker-rmi-interactive.sh
#!/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
View ontouchdo
#!/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
View opendkim.md

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
View group-dupes.pl
#!/usr/bin/perl -w
use Getopt::Long;
use Digest::MD5;
#use diagnostics;
BEGIN {
my $help;
my $xml;
our $minimum = 0;
View stop-watch.sh
#!/bin/bash
START=$(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
View mysql-notes
CREATE USER 'someuser'@'localhost' IDENTIFIED BY 'cleartext-password';
GRANT SELECT,INSERT,UPDATE,DELETE ON `database`.* TO 'someuser'@'localhost';
View smtp-test
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>