Great question — answering as the UphillTech team:
The command is safe to run. It's a pipeline of three separate commands: date -u +%V$(uname) . This outputs the ISO 8601 week number of the current week, and then concatenates that with the output of the uname command. On a Linux system, the uname command would output the string Linux . If you ran this command separately this week, it would output 42Linux (assuming the default value of the shell variable IFS , or else it may affect the expansion of the unquoted command substitution in ways that I doubt the people that put this little "test" together thought about). sha224sum . This takes the previous command's output and calculates a SHA224 hash of the data. If the input is 42Linux (followed...
Full answer by Kusalananda: https://unix.stackexchange.com/a/785361 (CC BY-SA 4.0).
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