henri

# How to just buffer each line (rather than the entire input stream) when using awk / gawk to read data from a pipe.
  awk '{ print $0 ; system("") }' # compatible with POSIX complient systems
  gawk '{ print $0 ; system("") }' # gawk is smart and will not actually start a sub-shell

  # fflush - is going to offer something similar (although you can speicify which kind of output you would like to flush).
 
  # remove first column (using white space) keep all other columns
  awk '{sub(/^[^[:space:]]+[[:space:]]+/, ""); print}'

henri

#!/bin/bash 

# This script is used to clear the arp cache on macOS - it may even work on other operating systems
# (C)2005 Henri Shustak
# Released Under MIT Licence : http://mit-license.org 

# check we are running as root
currentUser=`whoami`
if [ $currentUser != "root" ] ; then
        echo This script must be run with super user privileges

henri

# macOS 10.15 and later
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

henri

#!/bin/bash
# simple script for macOS systems. It will switch to the location specified below if it is exists.

switch_to_location="Automatic"

current_location=`scselect | grep "*" | grep -v "Defined sets include: " | awk -F "(" '{print $2}' | awk -F ")" '{print $1}'`
if [ "{$current_location}" != "{$switch_to_location}" ] ; then
	scselect "${switch_to_location}" 
	exit $?
fi

henri

Some programs will automatically save changes when closing files - Plan is to make a repository with a bunch of defaults which I use. For now it is a GitHub Gist.

Programs which seem to do this are listed below : 
   - Texttastic : https://www.textasticapp.com

More default settings now availble in a repository : 
https://github.com/henri/handy-settings-macOS/

---- CLI Details ----

henri

# select lines which start with upper case or lower case letter at the start of the line
grep -E "^[a-z]|[A-Z]"

# enable line buffering (useful for dealing with pipes and real time loops)
grep --line-buffered "search term"

# enable highlighting for a match but do not filter output (all of these examples will have a similar effect)
ack --passthru 'hightlight-match-string'
grep "^\|highlight-match-string" --color="always"
grep "^\|highlight-match-string" --color

henri

#!/bin/bash

# (C)2020 Henri Shustak
# Relased Under MIT LICENCE
# https://mit-license.org/

# benchmark bash function
# requires gdate to be installed (part of coreutils)

# This system is very basic and has some serious limitiations.

henri

#!/usr/bin/env bash
# find files within folder with creation time falling between 6PM and 9AM (change as required).

for f in /myfolder/* ; do
  var=$(date -r "$f" '+%H')
  if  [ $var -gt 18 ] || [ $var -lt 9 ] ; then
        ls -l "$f"
  fi
done

henri

# netstat (more similar to GNU/LINUX) on macOS
lsof -i -P | grep -i "listen" --line-buffered

henri

Summary	How to control (or Understand) your GIST page's files list order.
Notice	not official documentation.