Deleting/Clearing systemd journal files, like btmp, and other log files

Discussion of article Deleting/Clearing systemd journal files, like btmp, and other log files:

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Linux stores log files in /var/log/. These logs take large amount of disk space in several gigabytes after a few months. Most of the time, we don't need these data. Here we go to clean them. To prevent it to become that big in the future it's a pretty good idea to use logrotate.