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Renamer?Renamein this case, to$0which the shell would use as the script name if the shell had to generate an error message. If you don't care about possible error messages and just want to shorten the command, you could replaceRenamerwith_.-execdir mv {} "$(uuidgen).ext" \;? Is this just to get better error messages?{}is part of thefindcommand, notsh: it tellsfindwhere to put the file names. As for theRenamerpart, it is documented, albeit tersely, as part of the explanation of the shell's option-c. As for why useRenamerinstead of some other string, the discussion here may be helpful.mvis a spawned process but it is not subshell nor does it run in a subshell. Separately, if efficiency is a concern, I added code to the answer that runs only one shell for every several thousand files found.