How to get the system messages of my wiki up-to-date?

Please refer to the documentation: https://www.mediawiki.org/wiki/Extension:LocalisationUpdate

Nike (talk)‎05:28, 29 July 2016

Under the "Usage" section, I'm told to run something on the command line. What does it mean? Where is this 'command line'?

Guycn2 · ☎‎18:51, 29 July 2016
 
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