如何在Mac终端用Sox批量修剪子文件夹中的音频文件？

Got it, let's modify your script to automatically traverse all your subfolders and process each pair of .wav and .txt files. Here's a robust version that handles each directory safely:

#!/bin/bash

# Enable nullglob to handle cases where no files match (avoids errors)
shopt -s nullglob

# Traverse every subdirectory in the current folder
for dir in */; do
    # Skip if it's not a directory (just in case)
    if [ ! -d "$dir" ]; then
        continue
    fi

    echo "Processing directory: $dir"
    cd "$dir" || { echo "Failed to enter $dir, skipping..."; continue; }

    # Find the WAV and TXT files in the current directory
    wav_files=(*.wav)
    txt_files=(*.txt)

    # Check if we have exactly one WAV and one TXT file
    if [ "${#wav_files[@]}" -ne 1 ]; then
        echo "⚠️  Found ${#wav_files[@]} WAV files in $dir (expected 1), skipping..."
        cd ..
        continue
    fi
    if [ "${#txt_files[@]}" -ne 1 ]; then
        echo "⚠️  Found ${#txt_files[@]} TXT files in $dir (expected 1), skipping..."
        cd ..
        continue
    fi

    wav_file="${wav_files[0]}"
    txt_file="${txt_files[0]}"
    echo "Using file pair: $wav_file & $txt_file"

    # Your original trimming logic, adjusted for the current directory's files
    index=0
    start=""
    while read -r this; do
        # Skip empty lines in the TXT file
        [[ -z "$this" ]] && continue

        if [ "$index" -gt 0 ]; then
            # Calculate duration: end time minus start time
            duration=$(echo "$this - $start" | bc)
            # Trim the WAV file using sox
            sox "$wav_file" "clip-$index.wav" trim "$start" "$duration"
            echo "Created clip: clip-$index.wav (from $start to $this, duration $duration)"
        fi
        ((index+=1))
        start="$this"
    done < "$txt_file"

    # Go back to the parent directory to process the next subfolder
    cd ..
done

echo "✅ All processing complete!"

Key Improvements & Notes: #

• Directory Traversal: Uses a for loop to iterate over every subdirectory (*/) in your current working folder.
• Error Handling: Checks for exactly one WAV and one TXT file per folder, skips directories with missing/multiple files and prints warnings.
• Robust File Matching: Uses array variables (wav_files, txt_files) with nullglob enabled to safely handle missing files without throwing errors.
• Adjusted Trimming Logic: Replaces hardcoded sound.wav and times.txt with the actual files found in each subdirectory. Also uses bc to calculate duration explicitly (more reliable than $this-$start in some cases).
• User Feedback: Prints status messages so you can track which directory is being processed and which clips are created.

Before Running: #

1. Make sure sox and bc are installed on your system (most Linux distros have them by default; on macOS you can install via Homebrew: brew install sox bc).
2. Test the script on a small subset of your folders first to make sure it works as expected.
3. Ensure you have write permissions in each subfolder (to create the clipped audio files).

内容的提问来源于stack exchange，提问作者Bruce Wang