date -u %W

Displays the current week of the year.

uname

Displays the kernel name.

sha256sum

Generates a SHA-265 Hash Sum.

sed 's/\W//g'

Cuts out all non-word characters.

The |'s are redirecting the output of the first command to the appending command.

Enter the line in a terminal, f.e. gnome-terminal or xterm:

date -u +%W$(uname)|sha256sum|sed 's/\W//g'

Depending on the date and the operating system installed, this will output different hashes, like this:

2aa4cb287b8a9314116f43b5e86d892d76a9589559aa69ed382e8f5dc493d955

date -u %W

Displays the current week of the year.

uname

Displays the kernel name.

sha256sum

Generates a SHA-256 Hash Sum.

sed 's/\W//g'

Cuts out all non-word characters.

The |'s are redirecting the output of the first command to the appending command.

Enter the line in a terminal, f.e. gnome-terminal or xterm:

date -u +%W$(uname)|sha256sum|sed 's/\W//g'

Depending on the date and the operating system installed, this will output different hashes, like this:

2aa4cb287b8a9314116f43b5e86d892d76a9589559aa69ed382e8f5dc493d955