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I have file with two space separated word in each line. I am looking for shell scrip in Unix to replace the first word of each row with its md5 hash representation.

I have tried to adjust what is mentioned in Awk replace a column with its hash value.

But, it what this solution returns for md5 hash value looks wrong.

md5(is) = a2a551a6458a8de22446cc76d639a9e9
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    That's because the awk answers there use echo and that adds a newline... Replace it with printf %s you'll get the right hash: a2a551a6458a8de22446cc76d639a9e9 – don_crissti Sep 2 '15 at 20:34
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For an inefficient and possibly suboptimal answer:

while read -r first rest; do
    echo "$(echo -n $first | md5sum | awk '{ print $1 }') $rest"
done <input_file

This will mangle the whitespace between the first word and the rest of the line, but should preserve that between subsequent words, if any.

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