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Linux bcc tools使用总结（持续更新） - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...d -v -n 2 /proc/stat /proc/version /proc/uptime /proc/loadavg /proc/sys/fs/file-nr /proc/sys/kernel/hostname
0.998 tail 12103 6578 0 /usr/bin/tail -v -n 16 /proc/net/dev
1.000 df 12104 6578 0 /usr/bin/df
1.002 who 12105 6578 0 /usr/bin/w...
Remove folder and its contents from git/GitHub's history
... Just a side note: I used git count-objects -v to check if the files was actually removed but the size of the repository remains the same until I cloned the repository again. Git mantains a copy of all the original files I think.
– Davide Icardi
Jul...
How to change Vagrant 'default' machine name?
...reated a directory called nametest and ran
vagrant init precise64 http://files.vagrantup.com/precise64.box
to generate a default Vagrantfile. Then I opened the VirtualBox GUI so I could see what names the boxes I create would show up as.
Default Vagrantfile
Vagrant.configure('2') do |config|...
Convert an NSURL to an NSString
...ou're interested in the path represented by the URL (and to be used with NSFileManager methods for example):
[myUrl path];
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How to have the formatter wrap code with IntelliJ?
...
The "Ensure right margin is not exceeded" option is in File / Settings / Editor / Code Style / Java / Wrapping and Braces / Keep when reformatting
– Aaron
Jan 3 '16 at 8:11
...
PHP “pretty print” json_encode [duplicate]
I'm working on a script that creates a JSON file. Right now I'm just using json_encode (PHP 5.2.x) to encode an array into JSON output. Then I print the returned value to a file and save it. Problem is that the client wants to be able to open these JSON files for readability, so I'd like to add li...
Save image from URL by paperclip
...ay:
require "open-uri"
class User < ActiveRecord::Base
has_attached_file :picture
def picture_from_url(url)
self.picture = open(url)
end
end
Then simply :
user.picture_from_url "http://www.google.com/images/logos/ps_logo2.png"
...
At runtime, find all classes in a Java application that extend a base class
...the ServiceLoader mechanism.
Also many people roll their own by having a file in a well known classpath location (i.e. /META-INF/services/myplugin.properties) and then using ClassLoader.getResources() to enumerate all files with this name from all jars. This allows each jar to export its own provi...
Resetting remote to a certain commit
...
If you want a previous version of file, I would recommend using git checkout.
git checkout <commit-hash>
Doing this will send you back in time, it does not affect the current state of your project, you can come to mainline
git checkout mainline
...
Create Directory if it doesn't exist with Ruby
... nested directories. Assuming foo does not exist, you will receive no such file or directory error for:
Dir.mkdir 'foo/bar'
# => Errno::ENOENT: No such file or directory - 'foo/bar'
To create nested directories at once, FileUtils is needed:
require 'fileutils'
FileUtils.mkdir_p 'foo/bar'
# =&...