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I've got .txt list with files and corresponding MD5 hash:

ab16d9ab5682bb0038c901ad8fc424c0 *file1.doc
28bb8e092301340f19585201166e5b86 *file2.doc
5f53d5e9512a717049185fcf617b8a37 *file3.doc
3c28de2b988ce82b04803671540427e5 *file4.doc
75079fb178347e3f1b3b886589ca6471 *file5.doc

When .txt file is in directory:

  1. How to rename files to their hashes?
  2. How to rename hashes to their filenames?
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  • Are your files really named *file1.doc? Is the * part of the file name?
    – terdon ♦
    Oct 5, 2020 at 12:23
  • @terdon * is a flag that md5sum uses to indicate a binary file I think
    – steeldriver
    Oct 5, 2020 at 12:34
  • @steeldriver ah, OK. In that case, we'd need to remove it. Thanks
    – terdon ♦
    Oct 5, 2020 at 12:56
  • For clarification, would you mind editing the post to add the desired output for the input example you showed?
    – AdminBee
    Oct 5, 2020 at 14:17
  • 1
    Thanks @αғsнιη. Working now after remove 'echo'. Thanks again!
    – jack67
    Oct 6, 2020 at 11:50

1 Answer 1

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How to rename files to their hashes?

while IFS=' ' read <&3 -r hash fileName; do
    echo mv -v -- "${fileName#\*}" "${hash}";
done 3< infile.txt

How to rename hashes to their filenames?

while IFS=' ' read <&3 -r hash fileName; do
    echo mv -v -- "${hash}" "${fileName#\*}";
done 3< infile.txt

note: remove echo when you were happy with dry-run. -v is a non-standard extension supported by some mv implementations to tell them to be more verbose. If your mv doesn't support it, just remove it.

We open infile.txt on file descriptor 3 instead of stdin (0) so that it doesn't interfere with mv user prompting, if any.

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