Parallel Unix `sort` comparison

psort.sh

#!/bin/bash
# Compare Mac OS X 10.6's `sort` to latest GNU Coreutils `sort` which parallelizes by default.
# More info: http://www.cs.ucla.edu/classes/fall10/cs35L/assign/assign9.html

integers=10000000
file=`eval echo "~/Documents/integers1.txt"`

echo "Generating $integers integers..."
if [ ! -f $file ]; then
  for i in $(eval echo "{1..$integers}"); do
    echo $RANDOM
  done > $file
fi
echo "Done. Now let's sort them."

time sort $file > /dev/null
time sort -n $file > /dev/null

time gsort $file > /dev/null
time gsort -n $file > /dev/null