Spree loading countries in production

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Problem
You have installed Spree in a production server but haven’t populated the database with the default seed data, and you want to add the countries (or any other seed data) that come as default in spree in the vendor/spree/db/default_countries.yml file.

Solution
On your production server, after logging in with ssh and going to the application directory run the following rake task:

rake db:load_file[vendor/spree/db/default/countries.yml] RAILS_ENV=production

Splitting big files (Rails log files) in Linux command line

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Problem
You want to examine some big log files (ie Rails production files), on the command line in Linux but they are quite big.

Solution
You can use cat and grep to look for a specific part in the log files. You can also use grep with the A and B parameters to specify how many lines you want to include before and after the search text, but maybe you want to have chunks of the logs to examine. In that case you can use split to split them up in smaller files:

split --bytes=10M input_log_file.log [output_files_or_directory]

In that case you will be splitting your log file on size (–bytes variable), so you can decide depending on the total size of the log file how many files you want. The output files or directory is optional and if you leave it empty it will create the files in your current directory.

You can also split by the number of lines you want in each file like:

split --lines=15000 input_log_file.log [output_files_or_directory]