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Author Archives: Javier Vidal
Resuming scp after an interruption
It is not possible to make scp resume copying after an interrupted transmission. The good news is you can use rsync over SSH: rsync –rsh=’ssh’ -av –progress –partial source destination
Posted in system administration
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How to change the disabled property in jQuery
If you are using jQuery 1.6 or greater, there is a simple way to change the disabled property in an input field: $("input").prop(’disabled’, true); $("input").prop(’disabled’, false);
Posted in javascript
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Files that have been modified between two git branches
Before merging two branches that have been separated for a while, it is useful to know which files have been modified: $ git diff –name-status branch1..branch2
Posted in git
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How to install PostgreSQL on Ubuntu 12.04
Update your system with this PPA (Personal Package Archives) so you can install an up-to-date version of PostgreSQL: $ sudo apt-get install python-software-properties $ sudo add-apt-repository ppa:pitti/postgresql $ sudo apt-get update And now install PostgreSQL and the dev packages: $ … Continue reading
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How to install express on Ubuntu 12.04
Express is a node.js web application framework. Before installing express we need to install node.js and npm (Node Packaged Modules). I recommend you to update your system with this PPA (Personal Package Archives) so you can install an up-to-date version … Continue reading
Posted in javascript
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Skipping asset precompilation in capistrano if the assets did not change
The default capistrano task for compiling the assets compiles them every time, regardless of whether any assets were changed in the set of commits that you are deploying. This is the code snippet I use to check if the assets … Continue reading
Posted in rails
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On-the-fly tar
If you want to copy a directory recursively and preserve exact file timestamps, ownerships, and permissions you can do an on-the-fly tar: cd source-directory tar cf – . | (cd destination-directory; tar xf -)
Posted in system administration
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New feed
I’m going to delete the FeedBurner RSS feed of this blog, so if you want to keep subscribed you will have to re-subscribe to the new feed http://javiervidal.net/feed. Sorry for the inconvenience.
Posted in personal
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Rake task with arguments and :environment
Just a quick tip: desc "Rake task with arguments and :environment" task :task_name, [:arg1, :arg2] => :environment do |t, args| args.with_defaults(:arg1 => "Foo", :arg2 => "Bar") puts "Hello, #{args.arg1}. Bye, #{args.arg2}." end Notes: You may omit the #with_defaults call. You … Continue reading
Timestamps with Paperclip and S3
I’m using Paperclip (2.3.11) to upload images to S3 and, as some other people have pointed out, if the content of a file changes but its name remains the same (for example, if you recrop the image), the timestamp added … Continue reading
Posted in ruby
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