Find corrupted files using GM identify

find-corrupted-files.sh

folderToCheck='/Volumes/16TB/whatever/path'
outputFile=~/Desktop/files.txt
counter=1

Red="\033[0;31m"    # Red
Green="\033[0;32m"  # Green
Color_Off="\033[0m" # Text Reset

cd ${folderToCheck}
# Find all files and get count
count=$(find "$(pwd)" -type f -iname *.psd -o -iname *.psb | wc -l | xargs) # Optional count
# Find all files and iterate through all
find "$(pwd)" -type f -iname *.psd -o -iname *.psb | while read -r line ; do
    result=$(identify "${line}")
    if [ "$result" ] ; then
        echo "OK $line" >> $outputFile
        status=${Green}
    else
        echo "ERROR $line" >> $outputFile
        status=${Red}
    fi
    echo "${status}File ${counter} of ${count}${Color_Off} → ${line##*/}"
    counter=$(( $counter + 1 ))
done

echo "Wrote file ${outputFile}"
echo "-------------- DONE --------------"

Uhmm... actually it passes a psb file that is corrupted... I will investigate and report back!

UPDATE
It turns out that a PSB which has corrupted layers, but an OK composite image will pass the identify test without the -verbose flag (that's the reason why your original code was ultra-fast compared to mine). I've added -verbose, and apparently it works, even if I don't know enough shell scripting to understand why it is able to discern whether "$result" is an OK message or an Error :-)