wenyiyun
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datamapper tips
- 博客分类：
- db
"#{adapter_name}://#{username}:#{password}@#{host}/#{storage_name}"
scala tips
- 博客分类：
- scala
java -verion
java -jar scala-2.8.0.final-installer.jar
The name Scala is a contraction of the words scalable language.
sudo ln -s /home/wenbo/scala/bin/scala /usr/bin/scala
scala -version
Note that Scala uses square brackets ([...]) for parameterized types, whereas Java uses angle brackets (<... ...
a = $LOAD_PATH
require 'bundler/setup' #will change the value of $LOAD_PATH
b = $LOAD_PATH
a == b #fuck!
require "xsd/qname" 后$LOAD_PATH里会多一个
"/home/wenbo/.rvm/gems/ruby-1.9.2-p180/gems/soap4r-ruby1.9-2.0.0/lib"
ruby tips
- 博客分类：
- Ruby Hacking Guide
$LOAD_PATH
autoload
__LINE__ 行号
command tips
- 博客分类：
- ubunbu
:~$ dpkg -L chromium-browser
sudo find / -name grub.cfg
sudo dmidecode >info.txt;less info.txt
lspci |grep VGA
sudo vim /etc/sudoers
groups [OPTION]... [USERNAME]...
sudo usermod -a -G vboxusers wenbo
chkconfig
update-rc.d
sudo wget -r -p -np -k http://progit.org/
axel -n 10 -vo . http://xxx/ ...
sudo apt-get install memcached
/usr/bin/memcached -m 64 -p 11211 -u memcache -l 127.0.0.1
Thread.current[:memcache_client] = self.object_id if !@multithread
git remote show origin
git config -l
git blame models/user.rb
git branch -a #List both remote-tracking branches and local branches.
git var -l
git diff --cached #git diff --cached to see what you’ve staged so far
git-clean - Remove untracked files from the working tree
This is particularly useful i ...
Do not rebase commits that you have pushed to a public repository.
$ git checkout experiment
$ git rebase master
First, rewinding head to replay your work on top of it...
Applying: added staged command
Rebasing the change introduced in C3 onto C4.
It works by going to the common ancestor of the t ...
sudo apt-get install libqt4-opengl
dkpg -i
then run "virtualbox"
let’s assume that you have a directory containing three files, and you stage them all and commit. Staging the files checksums each one (the SHA-1 hash we mentioned in Chapter 1), stores that version of the file in the Git repository (Git refers to them as blobs), and adds that checksum to the staging ...
Because a branch in Git is in actuality a simple file that contains the 40 character SHA-1 checksum of the commit it points to, branches are cheap to create and destroy. Creating a new branch is as quick and simple as writing 41 bytes to a file (40 characters and a newline).
To see the last commit o ...
Everything in Git is check-summed before it is stored and is then referred to by that checksum.
The mechanism that Git uses for this checksumming is called a SHA-1 hash. This is a 40-character string composed of hexadecimal characters (0–9 and a–f) and calculated based on the contents of a file or d ...