rawiriblundell

#!/bin/bash

# Linear congruential generator, range 0 - 32767
# See: https://rosettacode.org/wiki/Linear_congruential_generator
# Usage: lcgrng (optional: number count, default:1) (optional: seed, default: epoch in seconds)
rnCount="${1:-1}"
rnSeed="${2:-$(date +%s)}"

# Here's an unnecessary nod to FreeBSD's rand.c
if [ "${rnSeed}" = 0 ]; then

rawiriblundell

#! /bin/bash

# If the special variable isn't available (e.g. dash shell), we fall back to a BSD-style
# Linear congruential generator (LCG) which we use to create our own '$RANDOM' variable
# See: https://rosettacode.org/wiki/Linear_congruential_generator

# If two invocations of RANDOM are the same (or both are blank), 
# then we're working with a shell that does not support $RANDOM.
if [ "${RANDOM}" = "${RANDOM}" ]; then

rawiriblundell

#!/bin/bash
#set -x

# Function to generate a reliable seed for whatever method requires one
# Because 'date +%s' isn't entirely portable, we try other methods to get the epoch
generate_seed() {
    # First we check if /dev/urandom is available.
    if [ -c /dev/urandom ] && command -v od >/dev/null 2>&1; then
        # Get a string of bytes from /dev/urandom using od
        od -N 4 -A n -t uL /dev/urandom | tr -d '\n' | awk '{$1=$1+0};1'

rawiriblundell

host2ip() {
  # If $1 is missing, print brief usage
  if [[ -n "$1" ]]; then
    printf '%s\n' "Usage: host2ip [hostname|ip.add.re.ss]"
    return 1
  # If $1 appears to be a node name, figure out its IP
  elif [[ "$1" =~ '^[a-zA-Z]$' ]]; then
    host -4 -W 1 "$1" | awk '{print $4}'
  # If $1 appears to be an IP address, try to figure the reverse  
  elif [[ "$1" =~ '^((25[0-5]|2[0-4][0-9]|[01][0-9][0-9]|[0-9]{1,2})[.]){3}(25[0-5]|2[0-4][0-9]|[01][0-9][0-9]|[0-9]{1,2})$' ]]; then

rawiriblundell

# Function to figure out daylight savings dates for the current year
dst() {
  local TZ
  # RHEL7 / systemd
  if command -v timedatectl >/dev/null 2>&1; then
    TZ=$(timedatectl status | awk -F ': ' '/Time zone/{print $2}' | awk '{print $1}')
  # RHEL5, RHEL6 and similar aged CentOS/Fedora/etc
  elif [[ -r /etc/sysconfig/clock ]]; then
    TZ=$(awk -F "=" '/ZONE/{print $2}' /etc/sysconfig/clock)
  # Older Debian family

rawiriblundell

if ! command -v cowsay &>/dev/null; then
  cowsay() {
    local msg
    if [[ -t 0 ]] && [[ -z $1 ]]; then
      msg="Moo!  What should I say?"
    elif [[ -n $1 ]]; then
      msg="$*"
    else
      msg=$(paste -sd ' ' - | sed -e "s/[[:space:]]\\+/ /g")
    fi

rawiriblundell

pretty () {
  while read -r; do
    printf "\033[38;5;%dm%s\033[0m\n" $(($RANDOM%255)) "${REPLY}";
  done
}

rawiriblundell

date() {
  case "$@" in
    (*"%o"*) 
      declare -a args1
      declare -a args2
      while [[ -n "$1" ]]; do
        args2+=("$1")
        if [[ "${1:0:1}" != + ]]; then
          args1+=("$1")
        fi

rawiriblundell

getAD-User-Info() {
  local userName adUserName
  userName="${1:?Username not supplied}"

  # Poll 'id' to either ensure the info is cached
  # or to error out if the user doesn't exist
  if ! id "${userName}" &>/dev/null; then
    printf -- '%s\n' "User '${userName}' could not be found"
    return 1
  fi

rawiriblundell

#!/bin/bash

# Because you never know what crazy systems are out there
if ! command -v apropos >/dev/null 2>&1; then
  apropos() { man -k "$*"; }
fi

# A small function to trim whitespace either side of a (sub)string
# shellcheck disable=SC2120
trim() {