Spellcheck each line

I'd like to write a bash filter that will take a file of n开发者_StackOverflowewline-separated sentences and return sentences that are not misspelled. I've been thinking about aspell but I'm not sure what to do with it. Any ideas?

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This pipe should give the results you want. Note that you should pipe something into this, so prepend e.g. cat input.txt | for a quick test.

while read line; do [ "$(ispell -l <<< "$line" | wc -l)" -gt 0 ] && echo "$line"; done

To also prepend a line number:

nl -b a -p | while read number line; do [ "$(ispell -l <<< "$line" | wc -l)" -gt 0 ] && echo "$number: $line"; done

If you want to return misspelled lines instead, just replace -gt by -le (or replace && by ||, of course)

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Of course you can save these lines as a script, and then simply do

script.sh < input.txt

if you so prefer

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Here is a script which does what you want.

#!/bin/bash

# Regex for lines describing "good words":
# - empty lines (after each line of input, i.e. at the end)
# - lines with only a '*' (indicating a good word)
# - a line with '@(#) '   (at the start of the output)
# All other lines indicate a bad word.
good_words='^[*]?$|^@\(#\) '

while read # read one line of input
do
    echo $REPLY | # pipe the line to aspell
    aspell pipe | # let aspell check the line
    egrep -q -v $good_words || # have a look if aspell found misspellings
    # no words with mistake, output the line
    echo $REPLY
done

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grep -v "$(aspell list < file)" file