Command line Fu

First, a confession. To get this to run on my Mac, I probably installed a bunch of stuff, such as Latex. I don’t remember what I did to make it work, so you will have to reverse engineer that. Here is the command I run to convert a Markdown document called document.md into a PDF […]

You can use the shell to extract a random sample of lines from a file in *nix. The two commands you need are “shuf” and “head” (+ “tail” for CSV files with a header). The shuf command will randomly shuffle all the lines of its input. The head command will cut of the input after

Fing logger (finglogger.sh): #!/bin/sh FING_LOG_FILE=/path/to/fing.log # append current public ip echo `date +”%Y/%m/%d %T”`”;publicip;”`curl -s ipecho.net/plain`”;;;” >> $FING_LOG_FILE # append current fing output /usr/bin/fing -r1 -o log,csv,$FING_LOG_FILE,1000 –silent Add to cron (run every hour): 0 * * * * /path/to/finglogger.sh

Docker allows you to develop, ship and run any application, anywhere. The metaphor is that of the standard shipping container that fits on any ship, can be handled by any crane, and loaded onto any train or truck. In a previous post, I covered how to run Ubuntu on Mac using Vagrant. In this post,

Vagrant is cool: Vagrant provides easy to configure, reproducible, and portable work environments built on top of industry-standard technology and controlled by a single consistent workflow to help maximize the productivity and flexibility of you and your team. Furthermore: Vagrant stands on the shoulders of giants. Machines are provisioned on top of VirtualBox, VMware, AWS,

Start PHP webserver (in current directory): php -S localhost:8080 # starts http server on port 8080 Start PHP prompt (with illustrating example):

The command wget is useful, but unfortunately doesn’t come preinstalled with Mac. Yeah, you can install it of course, but if you’re doing it from source, the process has a few steps to satisfy all the dependencies; start by configure make‘ing the wget source and work your was backwards until ./configure runs for your wget

In bash, you simply prefix a command with one or more XXX=”YYY” pairs, e.g. $ A=”B” X=”Y” python print_env.py … A=B X=Y The code for print_env.py: import os for ev in os.environ: print “{0}={1}”.format(ev, os.environ[ev])