#!/bin/sh
# Source: https://perlmonks.org/index.pl?node_id=11148773
#
# This is one shell implementation based on the problem specification ...
#
#   Rosetta Code: Long List is Long, 20221130,
#   by eyepopslikeamosquito
#   https://perlmonks.org/?node_id=11148465


case $# in
   0 )
      printf "Give a list of files to sort.\n" >&2
      exit 1
      ;;
esac

start=$( date '+%s' )

# Takes ~135 s.
awk '  \
   { cat_count[ $1 ] += $2 }  \
   END  \
   { for ( cat in cat_count )   \
      { printf "%s\t%s\n", cat, cat_count[ cat ] }  \
   }  \
   ' $@  \
| sort -k2,2rn -k1,1

end=$( date '+%s' )
printf "total time: %d s\n" $(( end - start )) >&2