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tomsaleeba /
Created Mar 9, 2018
BASH wait command demo
#!/usr/bin/env bash
# short demo on how to wait for multiple jobs
echo 'start'
sleep 2 &
echo "do things that don't require job 1 output"
sleep 4 &
echo "do things that don't require job 2 output"
wait $job1
tomsaleeba /
Last active May 16, 2018
Concatenating RDF Turtle files


When you have a series of *.ttl files in a directory and you want to cat them all together, you need to make sure you strip out the @prefix and only prepend it once to the output.

Use the following commands

# run *in* the directory with the TTL files
head -n 50 -q *.ttl | grep '^@prefix' | sort -u > header
time cat *.ttl | grep -v '^@prefix' | cat header - | gzip > $(basename $(pwd)).ttl.gz
rm header
tomsaleeba /
Created May 15, 2018
Deleting batches of records with SPARQL

I learned this when trying to clear our records in AWS Neptune. I was hitting the query timeout when trying to drop an entire graph. If you don't want to/can't raise the timeout, you can drop smaller parts of the graph in each transaction.

curl -sX POST http://<cluster-prefix> --data-urlencode 'update=
  GRAPH <> { ?s ?p ?o }
  GRAPH <> {
tomsaleeba /
Last active May 18, 2018
Bulk file rename

Assume have a directory of files in an project. We need to clone them all but rename and do a find+replace in them to work with another model name. The old model is plot and the new model is photo.

  1. Clone the directory and contents
    cp -r plot photo
    cd photo
  2. create a script to receive the results from our find:

tomsaleeba / async-await-error-handling.js
Created Jul 24, 2018
NodeJS async/await error propagation
View async-await-error-handling.js
// direct as promise
;(function () {
const prefix = '[direct-promise level]'
async function direct () {
throw new Error(`${prefix} explosion`)
direct().then(() => {
console.log(`${prefix} success`)
}).catch(err => {
tomsaleeba / extract-subgraph-3levels.rq
Last active Oct 23, 2018
Extracting RDF subgraphs using SPARQL
View extract-subgraph-3levels.rq
# this query extracts a subgraph from the selected subject (level 1) and two child levels
PREFIX aekos: <>
PREFIX some_dataset: <>
?s1 ?p1 ?o1 .
?s1 ?pv1 ?v1 .
?s2 ?p2 ?o2 .
?s2 ?pv2 ?v2 .
?s3 ?p3 ?o3 .
tomsaleeba /
Last active Jul 13, 2021
Debugging HTTP traffic with mitmproxy

This will let you see the request and response headers for traffic going through.

We're going to run this as a reverse proxy, rather than a usual proxy, so you don't get completely flooded with traffic.

Start the proxy

  1. create a new VM
  2. expose port 8080 to the public internet
  3. SSH to the VM
  4. make sure you have at least python 3.6
tomsaleeba /
Last active Feb 20, 2019
FISH shell VI keybindings with ctrl-<arrow> word navigation
  1. enable VI mode
  2. restore the word navigation keys I'm used to in insert mode
    cat << EOF > ~/.config/fish/functions/
    function fish_user_key_bindings
      bind -M insert \e\[1\;5C nextd-or-forward-word   # ctrl-right

bind -M insert \e[1;5D prevd-or-backward-word # ctrl-left

tomsaleeba /
Last active Dec 11, 2019
iNat bulk upload instructions

Which method is for me?

If you have a bunch of photos to upload, and they have location information embedded in the photo, then you have a few options.

  1. If they're on your phone, you can use our app (at the time of writing our app doesn't yet support reading the location information from photos, but it will)
  2. Use the "regular" upload method for iNat via their website

If you have observations that do not have a photo, or do have a photo but the photo does not have location information embedded in it, then the CSV based bulk upload if the best choice.