Bash: Add a random alphanumeric string at the end of files

Question

I would like to come up with a bash script that would add a random alphanumeric string to the end of all the files. I would like the string to have a length of 10.

So if I had the filename: hello.jpg It would become: hello_v41e6ebadx_.jpg

Does anyone have any ideas on how to accomplish this?

possible duplicate of [How do you generate passwords?](http://stackoverflow.com/questions/101362/how-do-you-generate-passwords) covers alphanumeric string generation, the rest if just variable manipulation and file renaming — Ciro Santilli Путлер Капут 六四事, Apr 28 '15 at 08:41

that other guy · Answer 1 · 2013-01-31T19:34:35.083

3

for file in *.*
do
    name=${file%.*}
    ext=${file##*.}
    random=$(LC_CTYPE=C tr -cd 'a-zA-Z0-9' < /dev/urandom | head -c 10)
    mv "$file" "${name}_${random}_.${ext}"
done

You can also consider mktemp, if no "X"s in your file extensions are likely to trip it up.

edited Jan 31 '13 at 19:34

answered Jan 31 '13 at 19:09

that other guy

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When I try this, I get the following error: tr: illegal byte sequence – mr hi Jan 31 '13 at 19:19
Try with LC_CTYPE=C in front of tr, to make it not attempt to parse anything as unicode. – that other guy Jan 31 '13 at 19:34

Bash: Add a random alphanumeric string at the end of files

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