#!/bin/bash
# input a file name like this:
#
# count_mem.sh filename.txt
#

if [ $# -eq 0 ]; then
    echo "example usage: $(basename $0) file.txt" >&2
    exit 1
elif [ $# -ge 2 ]; then
    echo "too many arguments" >&2
    exit 2
fi

sed s/' '/\\n/g "$1" | tr -d '[\.[]{}(),\!\\'\'''\"'\`\~\@\#\$\%\^\&\*\+\=\|\;\:\<\>\?]' | tr [:upper:] [:lower:] | 
sed "s/\blong\b//gi" | 
sed "s/\blist\b//gi" | 
sed "s/\bof\b//gi" | 
sed "s/\bexcluded\b//gi" | 
sed "s/\bwords\b//gi" | 
sed "s/\bhere\b//gi" | 
sed '/^$/d' | 
sort | uniq -c | sort -nr | less