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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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This particular combination of flags mimics Try CoffeeScript (on http://coffeescript.org/#try:) as closely as possible. And the `tail` call removes the comment `// Generated by CoffeeScript 1.6.3`.
See `coffee -h` for explanation of `coffee`'s flags.
This command is meant to be used to make a lightweight backup, for when you want to know which files might be missing or changed, but you don't care about their contents (because you have some way to recover them).
Explanation of parts:
"ls -RFal /" lists all files in and below the root directory, along with their permissions and some other metadata.
I think sudo is necessary to allow ls to read the metadata of certain files.
"| gzip" compresses the result, from 177 MB to 16 MB in my case.
"> all_files_list.txt.gz" saves the result to a file in the current directory called all_files_list.txt.gz. This name can be changed, of course.