spellcheck.sh (Source) 

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#!/bin/bash

set -o nounset
set -o errexit


# Commands -----------------------------------------------
ASPELL=/usr/bin/aspell
BASENAME=/usr/bin/basename
DIRNAME=/usr/bin/dirname
PWD=/bin/pwd


# Script -------------------------------------------------
extra=""
switch="--add-extra-dicts"

# file specific dictionary
# if there is a file with the same name
# but ending in `.pws`
# use it as an extra dict
directory=`$DIRNAME "$1"`
filename=`$BASENAME "$1"`
name="${filename%.*}"
dictpath=$directory/$name.pws
if [ -f "$dictpath" ]
then
    extra="--add-extra-dicts=`$PWD`/${dictpath}"
fi

# extra dicts from the current directory
# all files in the working directory
# ending in `.pws` are used as extra dicts

# return nothing if *.pws does not match anything
shopt -s nullglob

for filename in *.pws;
do
    extra="${extra} --add-extra-dicts=`$PWD`/${filename}"
done

$ASPELL $extra check "$1"