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Delete large number of files

I had to delete thousands of files. The command “rm” simply took forever. Then I learned you can use rsync to do the job.

First, create an empty directory such as

mkdir empty

Then, rsync it with the folder you want to delete using

rsync -av --delete empty/    todelete/

This is super fast comparing to rm.

Using perl

perl -e 'for(<*>){((stat)[9]<(unlink))}'

Record desktop videos using VLC media player

To record mouse, add the following options instead

:screen-follow-mouse :screen-mouse-image=file:///C:/Users/Pictures/Mouse.png

Integrate Mathjax with Gitlab

A quick (not the best way, though) way to integrate Mathjax with Gitlab. Tested on Gitlab 7.9.4 and Gitlab shell 2.6.0.

Create the file /home/git/gitlab/app/views/layouts/_mathjax.html.haml, e.g.,

sudo -u git nano /home/git/gitlab/app/views/layouts/_mathjax.html.haml

with the following content

  (function() {
    var ga = document.createElement('script');
    ga.type = 'text/javascript';
    ga.async = true;
    ga.src = ('');
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);

Then edit the file _head.html.haml

sudo -u git nano /home/git/gitlab/app/views/layouts/_head.html.haml

and change to the following (the first line already existed and the second line was newly added:

= render 'layouts/piwik' if extra_config.has_key?('piwik_url') && extra_config.has_key?('piwik_site_id')
= render 'layouts/mathjax'

Note one can control the use of mathjax just like the use of piwik.

Then restart gitlab using

sudo service gitlab restart

Install GitLab on existing Apache2 web server

First, setup a domain to point to the server such as

Second, follow the procedure at till the end of Step 6. Do not proceed with 7 to install Nginx.

If you are using MySQL, remember to setup mysql database.

Third, configure apache2

  • Enable proxy_http
    sudo a2enmod proxy_http
  • Create gitlab.conf with the following
    <VirtualHost *:80>
            #git lab passthrough
            ProxyPass         / http://localhost:8080/
            ProxyPassReverse  / http://localhost:8080/
  • Start apache2
    sudo a2ensite gitlab.conf
    sudo service apache2 reload
  • Configure sending emails through smtp. Add the following to /home/git/gitlab/config/environments
    config.action_mailer.delivery_method = :smtp
    config.action_mailer.perform_deliveries = true
    config.action_mailer.raise_delivery_errors = true
    config.action_mailer.smtp_settings = {
      :address              => "",
      :port                 => 587,
      :domain               => '',
      :user_name            => '',
      :password             => 'password',
      :authentication       =>  :plain,
      :enable_starttls_auto => true

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Note. Everything on this blog only reflects my personal view which may or may not be true and is not related to any organization or institute.

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