Bash script to sign all files and subfiles located in the the same folder than the script.

codesign.sh

#!/bin/bash

DEVELOPER_ID_APP=$1
export "DEVELOPER_ID_APP=$DEVELOPER_ID_APP"

signFile() {
  filename=$1
  echo "Signing FILE: $filename"
  codesign -s "$DEVELOPER_ID_APP" -f --timestamp -i <ANY_BUNDLE_ID> -o runtime "$filename"
}

export -f signFile
find . -exec bash -c 'signFile "{}"' \;

Call the script by using sh codesign.sh $DEVELOPER_ID_APPLICATION

The Developer Id Application variable should look like this: Developer Id Application: <Name> (123456789)