niun

Connected to my ESP8266-ESP-03 with following baudrate settings

BAUD = 9600
BOOT_BAUD = 115200

esp8266_at_test.py prints this:

PINGING esp8266...
> AT

>

niun

curl -G -s --data-urlencode "format=%FT%T%:z" http://www.timeapi.org/cet/now  # www.timeapi.org cet is CET/CEST. Don't use cest
date --iso-8601='seconds' -d "$(curl -s http://www.timeapi.org/utc/now)"      # www.timeapi.org use local timezone settings
date -d "$(curl -s http://www.timeapi.org/utc/now)" +"%FT%T (UTC%:z = %Z)"    # not quite ISO with timezone illustration
date -d "$(curl -s http://www.timeapi.org/utc/now)" +"%A %d.%m.%Y, %T (UTC%:z = %Z)" # non-ISO, easy readable by a german with day of week

date --iso-8601='seconds' -d "$(curl -s --head http://google.com | grep ^Date: | sed 's/Date: //g')" # google.com

date --iso-8601='seconds' -d "$(cat </dev/tcp/time.nist.gov/13 | cut -d' ' -f2,3) UTC" # NIST

 date --iso-8601='seconds' -d "$(cat </dev/tcp/de.pool.ntp.org/13)" # ntp pool project

niun

How to extract a single file with its history from a git repository

These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and should performed on a copy of the original repository (1.).

First the repository is reduced to just the subfolder containing the files in question using git filter-branch --subdirectory-filter (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.

Finally all remaining files are listed using git ls, the files to keep are removed from that using grep -v and the resulting list is passed to git rm which is invoked by git filter-branch --index-filter (3.). A bit convoluted but it does the trick.

1. copy the repository to extract the file from and go to the desired branch

niun

http://tuxtweaks.com/2010/10/remove-old-kernels-in-ubuntu-with-one-command/
dpkg -l linux-* | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e [0-9] | grep -E "(image|headers)" | xargs sudo apt-get -y purge

niun

rsync -raXi      --size-only /path/to/folder-to-backup/ /destinations/path/to/folder-to-backup
same as
rsync -rlptgoDXi --size-only /path/to/folder-to-backup/ /destinations/path/to/folder-to-backup
same as
rsync -rlptgoDXi --size-only /path/to/folder-to-backup /destinations/path/to

-r recursive
-l preserve links
-p preserve permissions (also updates permission on not transferred files)
-t preserve time        (also updates time on not transferred files)

niun

#!/bin/sh
#
#  Read-only Root-FS for Raspian
#
#  Modified 2015 by Pascal Rosin to work on raspian-ua-netinst with
#  overlayfs integrated in Linux Kernel >= 3.18.
#
#  Originally written by Axel Heider (Copyright 2012) for Ubuntu 11.10.
#  This version can be found here:
#  https://help.ubuntu.com/community/aufsRootFileSystemOnUsbFlash#Overlayfs

niun

# Source: http://thinkpad-forum.de/threads/179658-Wine-Wimp
# The exe installer does not work.
# Workaround: extract msi from exe, install msi.
wine WiMP-3.1.0.1858-NO.exe /extract
wine msiexec /i 8840086/WiMP-3.1.0.1858-NO.msi

niun

apt-get install device-tree-compiler
wget https://raw.githubusercontent.com/raspberrypi/documentation/master/configuration/images/dt-blob.dts
# for example, set P1:26 (BCM pin 7) to active low (on Raspi B Rev2.0, in dts file from August): 
awk 'NR==104{print "                  pin@p7  { function = \"output\"; termination = \"pull_down\"; }; // SPI_CE1_N (P1:26)"}1' dt-blob.dts > dt-blob-mod.dts
dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-mod.dts

niun

# Configuration file for tmux >= 2.1
# .tmux.conf gets automatically read if in user directory (~)

# use 256 colour terminal:
set -g default-terminal "screen-256color"

# enable mouse:
set -g mouse on

# Not needed in tmux 2.8?

niun

sudo nmap -sP 192.168.0.0/24 | awk '/^Nmap/{ip=$NF}/B8:27:EB/{print ip}'