编写批处理脚本：匹配同文件夹同名异扩展名文件并执行对应FFmpeg脚本

Got it, let's work through this file matching task for your same-folder scenario. First, let's confirm your file set to make sure I'm aligned:

file01.jpg file01.wav file02.jpg file03.jpg file04.jpg file04.wav

You want to run three different scripts based on whether a base filename (without extension) has both a .jpg and .wav, only a .wav, or only a .jpg. Here's a practical, shell-based solution that's easy to adapt:

Approach 1: Basic Loop & Check (Works in All Bash Versions) #

This method uses simple loops and file existence checks, so it's compatible with older bash versions.

Step 1: Collect Base Filenames #

First, we'll extract all unique base names from .jpg and .wav files:

# Grab all base names from jpg files (strip .jpg)
jpg_bases=$(for f in *.jpg; do echo "${f%.jpg}"; done)
# Grab all base names from wav files (strip .wav)
wav_bases=$(for f in *.wav; do echo "${f%.wav}"; done)

Step 2: Process Matching Pairs (Run script1) #

Loop through .jpg bases and check if a corresponding .wav exists. If so, run script1 and mark the base as processed:

processed_bases=""

for base in $jpg_bases; do
  if [ -f "$base.wav" ]; then
    echo "Executing script1 for matched pair: $base.jpg + $base.wav"
    ./script1 "$base.jpg" "$base.wav"
    # Track processed bases to avoid rechecking
    processed_bases="$processed_bases $base"
  fi
done

Step 3: Process WAVs Without Matching JPG (Run script2) #

Loop through .wav bases and check if they weren't processed (meaning no matching .jpg exists):

for base in $wav_bases; do
  if ! echo "$processed_bases" | grep -q "\b$base\b"; then
    echo "Executing script2 for orphaned WAV: $base.wav"
    ./script2 "$base.wav"
  fi
done

Step 4: Process JPGs Without Matching WAV (Run script3) #

Finally, loop through .jpg bases and check if they weren't processed (no matching .wav):

for base in $jpg_bases; do
  if ! echo "$processed_bases" | grep -q "\b$base\b"; then
    echo "Executing script3 for orphaned JPG: $base.jpg"
    ./script3 "$base.jpg"
  fi
done

Approach 2: Associative Arrays (Cleaner for Bash 4+) #

If you're using bash 4 or newer, associative arrays let you track file types per base name more efficiently:

# Declare an associative array to map base names to their file types
declare -A file_map

# Populate the array with .jpg entries
for f in *.jpg; do
  base="${f%.jpg}"
  file_map["$base"]+="jpg "
done

# Populate the array with .wav entries
for f in *.wav; do
  base="${f%.wav}"
  file_map["$base"]+="wav "
done

# Iterate through each base name and run the right script
for base in "${!file_map[@]}"; do
  file_types=${file_map["$base"]}
  if [[ $file_types == *"jpg"* && $file_types == *"wav"* ]]; then
    # Both file types exist: run script1
    ./script1 "$base.jpg" "$base.wav"
  elif [[ $file_types == *"wav"* ]]; then
    # Only WAV exists: run script2
    ./script2 "$base.wav"
  elif [[ $file_types == *"jpg"* ]]; then
    # Only JPG exists: run script3
    ./script3 "$base.jpg"
  fi
done

Key Tips #

• The ${f%.ext} syntax is a bash shortcut to remove the shortest suffix matching .ext from a filename—perfect for getting the base name.
• For the associative array method, make sure your bash version is 4+ (check with bash --version).
• Ensure your scripts (script1, script2, script3) are executable (run chmod +x script1 script2 script3) and accept the file arguments if needed.

内容的提问来源于stack exchange，提问作者markb