Linux / UNIX View Only Configuration File Directives ( Uncommented Lines of a Config File )

Most Linux and UNIX-like system configuration files are documented using comments, but sometimes I just need to see a line of configuration text in a config file. How can I view just the uncommented configuration file directives from squid.conf or httpd.conf file? How can I strip out comments and blank lines on a Linux or Unix-like system?

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How To check LXD container BTRFS disk usage on Linux

Here is a quick and dirty shell script I put to check LXD container size and how much space they are taking on the BTRFS subvolume. Naturally, you must run the script as a root user, and LXD must be configured with BTRFS storage backend on Linux operating systems. See how to set up and install LXD on Ubuntu 20.04 LTS using the apt command