gregmark

ntpdc -c loopinfo | awk '^offset: {print $2}'

gregmark

#!/usr/bin/perl

#####################################################################
###
### sort_ips.pl
### -----------
###
#####################################################################

use strict;

gregmark

#!/usr/bin/perl

#############################################################################
### poll_subs.pl: Net:SSH or Func guts
#############################################################################


use Data::Dumper;
our $SHELL_TRUE = 0;
our $DEBUG = 0;

gregmark

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

gregmark

aws ec2 describe-images \
--filters "Name=name,Values=kinetica*" --query \
"Images[*].{ID:ImageId,NAME:Name,DESC:Description,CREATED:CreationDate}"

gregmark

└─▪ curl --insecure -vvI https://porkbellies.randolph.duke.sell/ 2>&1 |
    awk 'BEGIN{cert=0} /^\* SSL connection/ {cert=1} /^\*  / {if(cert) print}'
*  subject: CN=*.randolph.duke.sell
*  start date: Dec  7 13:54:42 2020 GMT
*  expire date: Mar  7 13:54:42 2021 GMT
*  issuer: C=US; O=Let's Encrypt; CN=R3
*  SSL certificate verify ok.

gregmark

Bash array usage cheatsheet

• Creation
• Get elements
• Append element
• Array length
• Iteration
• Pass array to function
• Reference

gregmark

#!/bin/bash
# https://medium.com/@Drew_Stokes/bash-argument-parsing-54f3b81a6a8f

PARAMS=""
while (( "$#" )); do
  case "$1" in
    -a|--my-boolean-flag)
      MY_FLAG=0
      shift
      ;;

gregmark

#!/bin/bash

# me
# ------------------------------------------------------------------------------
script=$(basename $0)
script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &>/dev/null && pwd )"
script_path="${script_dir?}/${script}"


# error & usage

gregmark

VIM Help

CTRL-d - lists possible command completions 
TAB - cycles through possible command completions

Example:

:help tags (then CTRL-d and TAB)