How does this command work?

distro_dave

I saw this command on a forum as a question for registering: "date -u +%V$(uname)|sha256sum|sed 's/\W//g'" I think it depends on the time of my PC which changes every second, but the output is still the same every time I try it. So, can someone please explain how this command works?

Originally asked by Fat Mind on Stack Exchange (askubuntu) (CC BY-SA 3.0).

uphilltech

Great question — answering as the UphillTech team:

Let's break this into its constituent parts: The date part date -u : as explained in man date , the -u flag makes it print the Coordinated Universal Time +%V : the data command takes a format argument which is given after a + . For example: $ date +%m/%d/%y 05/04/14 See man date for a list of all the formats it can produce. The %V means: %V ISO week number, with Monday as first day of week (01..53) So, this week it will return: $ date +%V 18 And next week it will return 19 . $(uname) : this will simply print the result of the uname command which should be Linux on a Linux system. So, putting all that together, the date command will print WeekNumberLinux : $ date -u +%V$(uname) 18Linux The...

Full answer by terdon: https://askubuntu.stackexchange.com/a/460549 (CC BY-SA 3.0).

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