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Randomize lines (opposite of | sort)

Terminal - Randomize lines (opposite of | sort)
perl -wl -e [email protected]=<>; for $i (0 .. $#f) { $r=int rand ($i+1); @f[$i, $r][email protected][$r,$i] if ($i!=$r); } chomp @f; print join $/, @f;' try.txt
2009-12-21 21:15:55
User: JohnGH
Functions: join perl
0
Randomize lines (opposite of | sort)

print the lines of a file in randomized order

Alternatives

There are 7 alternatives - vote for the best!

Terminal - Alternatives
random -f <file>
2009-09-24 19:15:58
User: haplo
3

random(6) - random lines from a file or random numbers

sort -R
2011-07-15 15:35:27
User: RyanM
Functions: sort
2

Randomizes a file. The opposite of sort is sort -R!

cat ~/SortedFile.txt | perl -wnl -e [email protected]=<>; END{ foreach $i (reverse 0 .. $#f) { $r=int rand ($i+1); @f[$i, $r][email protected][$r,$i] unless ($i==$r); } chomp @f; foreach $line (@f){ print $line; }}'
2009-09-24 15:42:43
User: drewk
Functions: cat perl
0

The sort utility is well used, but sometimes you want a little chaos. This will randomize the lines of a text file.

BTW, on OS X there is no

| sort -R

option! There is also no

| shuf

These are only in the newer GNU core...

This is also faster than the alternate of:

| awk 'BEGIN { srand() } { print rand() "\t" $0 }' | sort -n | cut -f2-
ls -1 | xargs ruby -e'puts ARGV.shuffle'

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