DZone Snippets: one-liner code

ruby: random alphanumeric string

elliottcable (elliott cable) — Mon, 21 Jan 2008 09:03:01 GMT

generate random alphanumeric string 'size' characters long

size = 8; (1..size).map{([*('a'..'z')]+[*('A'..'Z')]+[*(1..9)].map{|n|n.to_s}).instance_eval{self[rand(self.size)]}}.join

Twitter bot weatherlisbon

griflet (guillaume riflet) — Mon, 18 Jun 2007 21:37:40 GMT

This little bash script shows how to use curl, grep, tail, sed and perl one-liners in order to compose a bleeding-edge twitter bot.
This one returns daily weather forecasts for Lisbon city based on the BBC weather forecast rss feed.



#! /bin/sh



#Goto here

here=/home/guillaume/Personal

cd $here



#BBC Lisbon weather id

id=0048



#BBC weather RSS feed address

feed="http://feeds.bbc.co.uk/weather/feeds/rss/5day/world/${id}.xml"



#City

city=lisbon



#temporary file

file="weather${city}"



#Weather twitter bot

twitbot=weatherlisbon:*******



#Timestamp the log file

echo .>> $file.log

date >> $file.log



#Read the RSS feed and filter it

curl $feed | grep 'title' | tail -n 1 | perl -wlne'm/title>(.*)<\/title/i && print $1' | sed -e "s/°//g" > $file.txt



#Read the forecast into a weather variable

read weather < $file.txt



#Twit the weather variable away

curl --basic --user $twitbot --data status="$weather" http://twitter.com/statuses/update.xml >> $file.log

wazup?!!!?!??1:!!??

jicksta (Jay Phillips) — Sat, 16 Sep 2006 01:19:27 GMT

Only in Ruby can something this awesome be possible!

Try to guess its output before you run it.



def wazup?(a) puts "#{a} dat!" end

wazup?!!!?!??1:!!??

Sierpinski Triangle - ruby one-liner

413x () — Tue, 28 Mar 2006 15:49:57 GMT



ruby -le'32.times{|y|print" "*(31-y),(0..y).map{|x|~y&x>0?" .":" A"}}'

Source: Signatures and one liners