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You don't even need to use rm in this case if you are afraid. Use find:

find . -name "*.bak" -type f -delete

But use it with precaution. Run first:

find . -name "*.bak" -type f

http://askubuntu.com/questions/377438/how-can-i-recursively-delete-all-files-of-a-specific-extension-in-the-current-di

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#Simple Authentication with Bcrypt

This tutorial is for adding authentication to a vanilla Ruby on Rails app using Bcrypt and has_secure_password.

The steps below are based on Ryan Bates's approach from Railscast #250 Authentication from Scratch (revised).

You can see the final source code here: repo. I began with a stock rails app using rails new gif_vault

##Steps

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sudo apt-get install virtualbox-guest-utils virtualbox-guest-x11 virtualbox-guest-dkms

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#include <stdio.h>

void func ( void (*f) (int) );

void print ( int x ) {
    printf("%d", x);
}

int main(int argc, const char *argv[]) {
    func(print);

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http://www.patosai.com/blog/post/installing-gdb-on-mac-os-x-yosemite

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sudo tar -C /usr/local --strip-components 1 -xzf ~/Desktop/node-v4.2.1-linux-x64.tar.gz

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1. 
2. Chinese input
3. terminal font size tweak

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# Default termtype. If the rcfile sets $TERM, that overrides this value.
set -g default-terminal screen-256color

# support logging out and back in
set -g update-environment "SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"

# pbcopy support
set-option -g default-command "reattach-to-user-namespace -l bash"

# vi mode

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# Mac have python installed, just make sure
brew install python

# install pip
sudo easy_install pip  
# if no use, then
curl https://bootstrap.pypa.io/ez_setup.py -o - | sudo python
sudo easy_install pip  

# install powerline

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type state = int;;
type 'a dfa = {
  current_state : state;
  transition_function : (state * 'a * state) list;
  final_states : state list;
};;
type decision = Accept | Reject;;

let a_b_even_dfa : char dfa =       (* input symbols are characters *)
  { current_state = 0;