Jason Dusek solidsnack

The lyf so short, the craft so longe to lerne.

solidsnack / syslogged

Created July 26, 2013 18:08

Wrapper for logging any command's STDOUT and STDERR to syslog.

	#!/bin/bash
	set -o errexit -o nounset -o pipefail
	function -h {
	cat <<EOF
	USAGE: syslogged <program> <args>

	Wraps a command invocation with logging, sending STDOUT and STDERR to
	syslog, setting the syslog tag to:

	<program>[<pid>]

solidsnack / cio.scala

Last active December 20, 2015 07:49

Demo of concurrent, side-effecting operations in Scala with a configurable thread pool.

	import scala.concurrent._
	import scala.concurrent.duration._
	import java.util.concurrent.Executors.newFixedThreadPool

	val logger = java.util.logging.Logger.getLogger("par")
	def f(n: Int): Int = {
	Thread.sleep(20000)
	logger.info(f"$n%04d")
	n*2
	}

solidsnack / ips.bash

Created August 1, 2013 04:39

Find IPs, on OS X and Linux

	function ips {
	/sbin/ifconfig \| tr '\t' ' ' \| # OS X gives us tabs, remove them
	sed -n '/^ *inet / { s/// ; p ;}' \| # Only IPv4, thanks
	cut -d' ' -f1 \| # Throw away everything but the addr
	sed s/addr:// \| # Strip addr: prefix on Linux
	fgrep -v 127.0.0.1 # We already know about this one
	}

solidsnack / tarmap.scala

Created August 8, 2013 23:41

Tar as the JSON of UNIX

	import org.kamranzafar.jtar._
	import java.io.{ByteArrayInputStream, ByteArrayOutputStream}
	import scala.collection.mutable.ArrayBuffer
	import com.google.common.base.Charsets

	object Tar {
	def toTar(entries: Map[String,String]): Array[Byte] = {
	val bytesOut = new ByteArrayOutputStream()
	val archive = new TarOutputStream(bytesOut)
	val mTime: Long = System.currentTimeMillis() / 1000

solidsnack / powerset.md

Created October 16, 2013 19:25

Haskell example:

powerset :: (Eq t) => [t] -> [[t]]
powerset [   ] = []
powerset [ h ] = [ [h] ]
powerset (h:t) = map (h:) sub ++ sub
 where sub = powerset t

solidsnack / isset.bash

Created November 20, 2013 08:42

Demo of ${_+} predicate in Bash.

solidsnack / ln_libjvm.bash

Created November 20, 2013 19:18

	#!/bin/bash
	set -o errexit -o nounset -o pipefail
	function -h {
	cat <<USAGE
	USAGE: ln_libjvm.bash

	Symlink a likely libjvm.so into /usr/bin.

	USAGE
	}; function --help { -h ;}

solidsnack / lockedup.sh

Last active December 29, 2015 19:09

solidsnack / scan_path.bash

Created December 1, 2013 23:04

Not useful today...but seems like it will come in handy.

	function check_path_for_usr_local_bin {
	printf %s "$PATH" \| while read -d: -r line
	do printf '%s\n' "$line"
	done \| fgrep -qx /usr/local/bin
	}

solidsnack / mesos-attrs-causes-slave-upgrade

Created December 17, 2013 19:34

Can be fixed with: /usr/local/sbin/mesos-slave --recover=cleanup

	I1217 19:23:11.844920 2201 state.cpp:33] Recovering state from '/tmp/mesos/meta'
	Incompatible slave info detected.
	------------------------------------------------------------
	Old slave info:
	hostname: "ip-10-46-210-228.ec2.internal"
	webui_hostname: "ip-10-46-210-228.ec2.internal"
	resources {
	name: "cpus"
	type: SCALAR
	scalar {

	function ips {
	/sbin/ifconfig \| tr '\t' ' ' \| # OS X gives us tabs, remove them
	sed -n '/^ *inet / { s/// ; p ;}' \| # Only IPv4, thanks
	cut -d' ' -f1 \| # Throw away everything but the addr
	sed s/addr:// \| # Strip addr: prefix on Linux
	fgrep -v 127.0.0.1 # We already know about this one
	}