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How to split a file into smaller chunks?

You may want to upload a 100GB file over an unstable network, or feed your scripts smaller inputs to load in RAM. In both cases, just splitting your file into smaller chunks is an easy solution.

Great news is Unix/Linux systems have the split utility already installed. And using it is simple as pie:

Cut a binary file into chunks of X bytes:

split -b X bigfile.avi

How to delete lines containing a given string?

Just like last week, where we wanted to replace a string, we can use sed for this task:

sed '/pouet/d' file.txt

This will output file.txt on stdout without the lines containing pouet.

How to replace a string in a file?

The simplest way to proceed is to use sed. It‘s available both on Mac and Linux. Here is the gist of it:

sed -i 's/old/new/g' file.txt

Here we’re replacing old with new.

How to find the PID of a process using a given port?

Sometimes you have a process you lost the PID, and would like to kill it.

You can use top (or better htop) to search for your process name and press k to kill it. But this isn’t optimal when you aren’t sure of its name. A better alternative is to search by the port opened, for example port 80:

sudo lsof -i :80

How to copy SSH keys to another machine?

Public key authentication is generally safer than password-based and is way more convenient.

SSH offers a command to set it up, ssh-copy-id (part of the openssh client package) will copy your public key to the remote machine. Use it like this:

ssh-copy-id -i ~/.ssh/my_key.pub remote-machine

	import pandas as pd
	import numpy as np
	import fastparquet
	from sqlalchemy import create_engine, schema, Table

	# Copied from pandas with modifications


	def __get_dtype(column, sqltype):
	import sqlalchemy.dialects as sqld

	init python:

	class DynamicBlink(renpy.display.layout.DynamicDisplayable):
	"""
	A dynamic image that blinks every now and then
	"""

	def __init__(self, args, *kwargs):
	self.current_image = args[1]
	self.blink_st = -1.0 # arbitrary number to force normal start

	#!/usr/bin/env python

	import tkinter as tk
	import math
	import re
	from collections import ChainMap

	Nrows = 5
	Ncols = 5

	#!/bin/bash
	# Adicione um novo remote; pode chamá-lo de "upstream":

	git remote add upstream https://github.com/usuario/projeto.git

	# Obtenha todos os branches deste novo remote,
	# como o upstream/master por exemplo:

	git fetch upstream