To help sort out your multipass renders!

sort_renders.sh

#!/bin/bash

# sort_renders.sh - Sorts multipass renders in a given directory
# usage: sort_renders.sh [directory]

## Here are some things to customize:

# Populate this with a list of all the pass names seperated by spaces
PASSNAMES="foo bar baz quux _ao"

# Set this to cp to copy or mv to move
COPY_OR_MOVE="cp"

## And here is the program:

function printUsage {
    echo Please provide a directory of renders to sort
    echo Usage: $0 [directory]
    exit 1
}

# Check for a directory
if [ -z $1 ]; then
    printUsage
fi

DIRECTORY=$1

# Find files in the unsorted directory that match the passname and move or copy them
for PASS in $PASSNAMES; do
    echo Processing $PASS
    find $DIRECTORY -maxdepth 1 -type f -name "*_$PASS*"  -exec mkdir -p $DIRECTORY/$PASS ';' -exec $COPY_OR_MOVE {} $DIRECTORY/$PASS/ ';'
done