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Shuffle lines

 $ seq 5 | perl -MList::Util -e 'print List::Util::shuffle <>'

— by openiduser3 on Oct. 25, 2014, 10:40 p.m.

Explanation

Sorting lines is easy: everybody knows the sort command.

But what if you want to do the other way around? The above perl one-liner does just that:

  • -MList::Util load the List::Util module (as if doing use List::Util inside a Perl script)
  • -e '...' execute Perl command
  • print List::Util::shuffle <> call List::Util::shuffle for the lines coming from standard input, read by <>

Another way would be sort -R if your version supports that (GNU, as opposed to BSD). In BSD systems you can install coreutils and try gsort -R instead. (For eample on OSX, using MacPorts: sudo port install coreutils.)