批量处理Zip/MKV文件脚本：多文件场景下重命名异常排查求助

Hey there! Let's figure out why your script works flawlessly for single files but breaks when dealing with multiple zips and MKVs. First off, it’d be a huge help if you could share the actual script code you’re running—without that, we’re making educated guesses, but I can walk through the most common pitfalls that cause this kind of filename chaos.

Common Culprits to Check #

• Loop Variable Scope Issues (Subshell Gotchas)
  If you’re using a pipeline in your loops (like find . -name "*.zip" | while read zipfile), the zipfile variable lives in a subshell. Any values or changes here won’t carry over to other parts of the script (like your MKV processing loop). This often leads to the last processed filename being reused for all subsequent operations, causing mismatches.

• Mismatched File Processing Order
  When extracting SRTs from zips, your script might iterate through zip files in one order (e.g., alphabetical), but process MKVs in a different order (e.g., modified time). This means the first extracted SRT gets paired with the first MKV, even if they don’t belong together.

• Accidental SRT Overwrites
  If multiple zip files contain SRTs with the same name (like subtitle.srt), extracting them all to the subs/ directory will overwrite older files. You’ll end up with only the last extracted SRT, which then gets incorrectly renamed for every MKV.

• Incorrect Multi-File Handling in mv
  A big red flag: if your rename step uses something like mv subs/*.srt "${mkv_base}.srt", this breaks when subs/ has multiple SRTs. The shell expands subs/*.srt to a list of files, and mv will try to move all of them to the last argument (your target filename). Since that target is a file (not a directory), this either throws an error or overwrites files randomly.

Debugging Steps to Pinpoint the Issue #

1. Add Debug Echoes
   Stick echo statements in your loops to print what’s happening at each step. For example:

   for zipfile in *.zip; do
     echo "Extracting SRTs from: $zipfile"
     # Your extraction code here
   done
   
   for mkvfile in *.mkv; do
     mkv_base="${mkvfile%.mkv}"
     echo "Matching MKV: $mkvfile | Target SRT name: $mkv_base.srt"
     # Your rename code here
   done
   

   This will show you if files are being paired correctly.

2. Inspect the subs/ Directory Mid-Run
   Run the extraction part alone, then check subs/—do you have all the SRTs you expect? Are any missing or overwritten?

3. Verify Variable Values
   Make sure variables like mkv_base or the extracted SRT filename are being parsed correctly. For example, use echo "Parsed MKV base: $mkv_base" to confirm you’re getting the right name without the .mkv extension.

Once you share your script code, we can zero in on exactly where things are going wrong!

内容的提问来源于stack exchange，提问作者menteith