stdbuf – Run COMMAND, with modified buffering operations for its standard streams
While piping together commands that only output intermittently we run into the pipe buffers created by the pipe() system call (also see overview of pipes...
Category: Software Development
A quick start for Python decorators
Synopsis #!/usr/bin/env python3 import shutil # Decorator which pre-checks the space in /tmp # and throws an exception if the space is more than #...
PyCon(line) AU 2020 Rube Codeberg competition
This is for fun, for silliness and for do not use anywhere-ness – or to quote the instructions: If you’ve ever wondered just how egregious...
perl oct(‘0b…’) to interpret binary strings
This is really a quick reminder about a perl function which does a little more than you’d perhaps expect. Need to convert a binary (or...
single quote characters in a single-quoted string in shells
A very quick and simple comment on building single-quoted strings in shell scripts which include single quotes. Note that it’s not possible to include a...
Exception-al perl signals
Scenario For a certain code-base it’s decided it would be useful to be able to trigger an exception on-demand (mid-way through a process working). Why?...
pip – Cannot fetch index base URL http://pypi.python.org/simple/
You want to use pip to install a module from PyPI. However your server distribution in a little old (at the time of writing this...
On the importance of reading the docs – PHP’s date_parse errors
It’s important to read the documentation, and then read it again once or twice. PHP’s date_parse function parses a datetime string and returns an “array with information...
perl =~ operator interprets a RHS expression at run-time
This article starts with a conversation about adjusting compiled perl regular expressions and a sudden realisation – which went a little along the lines of:...
Joining log lines with sed
It’s often the case when analysing system logs that you want to create a summary bringing together data from different lines of a log –...