| #!/usr/bin/env python | |
| # Very simple CSV to JSON converter | |
| # Supports CSV labels | |
| # Usage: | |
| # (without labels) | |
| # csv-to-json.py ./data.csv > ./data.json | |
| # like: [ [ 1, 2, 3 ] ] | |
| # (with labels) | |
| # csv-to-json.py -l ./data.csv > ./data.json |
| #!/bin/sh | |
| # A tool to find superblocks in an EXT4 volume (probably easily adapted for EXT2,3) | |
| # The usecase for this tool is likely pretty narrow... | |
| # I have an LVM volume on a RAID array that was incorrectly reassembled (i.e. recreated) | |
| # in the wrong order (I think), and I'm trying to recover from it, but it's unrecognizable | |
| # as a filesystem since the primary superblock is missing. | |
| # This tool identifies all (seemingly) valid superblocks in a volume, though using them may | |
| # introduce other errors if your filesystem is badly damaged. USE WITH CAUTION. | |
| # The goal is to estimate how far offset the superblocks are and if disc order in the array |
| #!/bin/sh | |
| # Assumes images are broken out into 1024mb chunks, separately gzipped, | |
| # stored as ./image/image.X.blob.gz, where X is an integer (0...). | |
| # Decompresses and writes 6 in parallel (i.e. threading) since Gzip is slow. | |
| DEVICE=$1 | |
| sectionsize=1024 | |
| maxthreads=5 | |
| curthreads=0 |
| #!/bin/bash | |
| # THIS IS A WORK IN PROGRESS, might break things. | |
| # Sets up LXC host configuration in AWS EC2 environments | |
| # Reference: http://www.activestate.com/blog/2011/10/virtualization-ec2-cloud-using-lxc | |
| # Exit NOW because we don't want to blow anything up outside our test systems | |
| # (This is being drafted in a production environment.) | |
| exit 1 | |
| echo 'none /sys/fs/cgroup cgroup defaults 0 0' >> /etc/fstab |
| // This one only supports the '{0}' syntax for now... | |
| function _format(p){var x = arguments;return p.replace(/\{([0-9]+)\}/g, function($0,n){ return x[1+Number(n)] })} |
Generates least-cost paths from an adjacency list with one cost factor per edge.
Simply because I needed the refresher, having taken my last Computer Science class nearly a decade ago, and having focused on a different domain of problems in recent years.
I wanted the practice. :)
| /* Functions available in Redshift that can be emulated in Postgres for compatibility. | |
| * This is most applicable when a schema needs to be migrated into a (local) PostgreSQL | |
| * environment for modeling/development. As Redshift is derived from PostgreSQL, many | |
| * DBA and related modeling tools designed for PostgreSQL are _not quite_ viable for | |
| * use with Redshift. These functions attempt to augment native PostgreSQL to allow | |
| * Redshift SQL to run in other Postges environments. | |
| * I'll update this periodically with additional functions as needed. | |
| */ | |
| CREATE FUNCTION public.getdate() returns timestamptz |
| ## to encrypt | |
| openssl aes-256-cbc -e -in plaintext.txt -out crypted.blob | |
| ## to decrypt | |
| openssl aes-256-cbc -d -in crypted.blob -out plaintext.txt |
| #!/usr/bin/env python | |
| # Python support for PERL's shorthand of pattern substitution (s/.../.../) | |
| # Supports flags: | |
| # i => case insensitive | |
| # m => multiline match (caret and dollar represent line terminations, not whole-string) | |
| # s => "dot-all" - dot matches everything, including new-line | |
| # g => "global" - replace every instance (without this, only the first) | |
| import re |
| #!/bin/sh | |
| # Show duplicate files (compared by MD5 hash) | |
| find ./ -type f -print0 | xargs -0 md5sum | sort | uniq -w 32 -D | |
| # Remove smart-quotes from a buffer/file | |
| sed "s/[”“]/\"/g; s/[’‘]/'/g" | |
| # Rename a series of files (e.g. restore backups) by regular expression in OS X | |
| find ./ -type f -name '*.bak' -print | sed -E 's/(.*)\.bak$/mv "&" "\1"/' > rename.sh |