Dev-Feeds

Ruby
chars = ("a".."z").to_a + ("1".."100").to_a
random1 = Array.new(10, '').collect{chars[rand(chars.size)]}.join

Javascript:
var rand = Math.random() * 1000000000 * Math.random();
or
var rand = Math.random() * 1000000000


This is another efficient way to generate random number

Example: 
@user = Users.find(params[:id])
@user_new = User.new(@user.attributes)
@user.created_at = Time.now #update the field in the new record
@user_new.save

Javascript
var str = "055"
str = str.parseInt;
alert(str);    // this alerts the integer value 55

svn diff <file-name>
--- app/asdf.html   (revision 4564)
+++ app/asdf.html   (working copy)

< will list the difference between the working copy and latest revision>

grep -rl "date_functions()" app/


Output  Controls
-R, -r, --recursive       equivalent to --directories=recurse
-l, --files-with-matches  print only names of FILEs containing matches