todgru

#launchd Usage

I have a bash script called foo.sh that takes one command line argument, bar. I want it to run every 60 seconds and load at startup.

• an XML plist is Apple Property List
• com.mydomain.foo.plist Name of launchd plist file should be a reverse fqdn, like (this may not be required, but convention)
• com.mydomain.foo.plist lives in $HOME/Library/LaunchAgents and is ran as that user.
• com.mydomain.foo.plist can also live /Library/LaunchDaemons or /Library/LaunchAgents, have requirements, ran as root
• Load plist with launchctl load com.mydomain.foo.plist
• Unload plist with lauchctl unload com.mydomain.foo.plist

todgru

see https://github.com/defunkt/resque#section_The_Front_End_Standalone

"If you've installed Resque as a gem running the front end standalone is easy:"

$ resque-web

todgru

#SOLID

• S SRP Single responsibility principle, an object should have only a single responsibility.
• O OCP Open/closed principle, “software entities … should be open for extension, but closed for modification”.
• L LSP Liskov substitution principle, “objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program”. See also design by contract.
• I ISP Interface segregation principle, “many client-specific interfaces are better than one general-purpose interface.”
• D DIP Dependency inversion principle, one should “Depend upon Abstractions. Do not depend upon concretions.” Dependency injection is one method of following this principle.

see http://en.wikipedia.org/wiki/SOLID_(object-oriented_design)

todgru

#Setting mp3 tags, ID3 from command line

install using brew, brew install id3lib

set tag:

$ id3tag --artist="The Best Band Ever" --album="Greatest Hits" --song="Number One Forever" --year="1975" --track="1" --total="12" --genre="Jazz"

help

todgru

#BASH

BASH Process Control

response=$(curl --write-out %{http_code} --silent --output /dev/null servername)

• Start <command>, assign the pid value to $PID, sleep for N minutes. Then end process $PID:

& PID=$!

todgru

• du -sh {directory} list display size of directory in human readable format.
• du -sh * show size of each directory in the current path
• df disk space usage

$ du -sh *
 11M  Applications
1.9G	Desktop
 14G	Documents
8.0K	Downloads

todgru

#!/usr/bin/perl

use v5.10;

use strict;
use warnings;

# Usage: gist_backup.pl <user>
# Clone all the gists of a GitHub user

todgru

#!/bin/sh
#cloneall.sh by Jan-Piet Mens, February 2012
# Obtain a list of gists (mine) and clone them into the current directory
# Requires jsonpipe (https://github.com/dvxhouse/jsonpipe)

URL=http://gist.github.com/api/v1/json/gists/jpmens
CLONEURLFMT="git://gist.github.com/%d.git\n"

curl -qs $URL | 
	jsonpipe -s ' '  |

todgru

list only directories names

ls -1F | grep / | sed 's_/$__'

for fn in `ls -1F | grep / | sed 's_/$__'`; do
    echo "the next file is $fn"

done

todgru

vim git gpg

• brew install gnugp
• might need to comment out line 223 of ~/.gnupg/gpg.conf
• gpg --gen-key generate key
• gpg --list-key show key lists

see: http://enter2exit.wordpress.com/2011/03/01/managing-passwords-with-vimgpggit/ http://www.madboa.com/geek/gpg-quickstart/