使用bash / regex重命名特定目录中的文件

Question

I'm trying to create some hotfolders using LaunchControl and in part of the script I would like files in a specific directory to be renamed if they match certain criteria. The problem I'm having is not in the renaming part, it is in getting the script to call the directory. All the scripts or articles I find online only help in renaming the files, not in correctly calling the directory path as part of the renaming script. Doesn't seem it would be that hard but I can't work it out.

Here's what I have tried so far, which does nothing. If I CD to the directory though and leave out the part where it is calling the directory it will rename the files.

find . -mindepth 3 -type f -iregex '.*/Volumes/COMMON-LIC-PHOTO/ASPERA/ASPERA_STAGING/.*' -print0 |
xargs -0 rename -v 's/([0-9]*)_LK/$1_standard/' \;

Answer 1

Use something like this at the beginning of your script:

#!/bin/bash

target_directory=/Volumes/COMMON-LIC-PHOTO/ASPERA/ASPERA_STAGING
cd "$target_directory" || {
    echo "Error cd'ing to $target_directory" >&2
    exit 1
}

...and then leave off the -iregex part of your find command. Some notes on this:

• find . searches under the current directory , and if you haven't set that in the script, you don't know what it'll be. If you run that from the root directory ("/"), it'll search every directory and file you have permissions to (throwing errors for the ones you don't), and then discard the ones that aren't in the target directory; it's much better to just search the target directory. You could also accomplish this with find "$target_dirctory" .

• In my snippet above, I assumed that the directory is known and fixed, so it can just be included literally in the script. If that's not the case, something more complicated will be needed to set it correctly.

• I added an error check to the cd command -- you should always do this when using cd in a script; otherwise if something goes wrong, the rest of the script will execute in the wrong directory, with potentially weird/destructive consequences. Actually, I prefer to avoid using cd at all in scripts, and just use explicit paths -- it's generally safer and simpler.

Answer 2

If your version of find has the -execdir feature, then you could do something like this (I cannot test right now):

find . -mindepth 3 -type f -iregex '.*/Volumes/COMMON-LIC-PHOTO/ASPERA/ASPERA_STAGING/.*' -execdir rename -v 's/([0-9]*)_LK/$1_standard/' {} \;

Notice the {} near the end, it signifies the matched path. The -execdir flag executed the command in the directory of the matched file.