Shell script to move a folder of correctly-named image files into their respective .xcassets subfolders

moveAssetImages.sh

#!/bin/sh

function moveAssetImages
{
    usage="usage: moveAssetImages /path/to/folderOfImages /path/to/Images.xcassets"

    sourceDir=$1
    assetsDir=$2

    if [ $# != 2 ]; then
        echo $usage
        return
    fi

    if [[ ! -d $sourceDir ]]; then
        echo "Directory not found: $sourceDir"
        return
    fi

    if [[ ! -d $assetsDir ]]; then
        echo "Directory not found: $assetsDir"
        return
    fi

    echo $assetsDir
    if [[ `echo $assetsDir |  awk -F . '{print $NF}'` != "xcassets" ]]; then
        echo $usage
        return
    else
        for image in $sourceDir/*
        do
            filename=`basename $image`
            extension=`echo $filename | awk -F . '{print $NF}'`
            nameWithoutExtension=`basename $image .$extension`

            # strip suffixes like ~iPad
            if [[ $nameWithoutExtension == *"~"* ]]; then
                deviceSuffix=`echo $nameWithoutExtension | sed 's/.*~//'`
                nameWithoutExtension=`basename $nameWithoutExtension "~$deviceSuffix"`
            fi

            # strip suffixes like @2x
            nameWithoutExtension=`basename $nameWithoutExtension @2x`

            # move files into place
            if [[ -e $assetsDir/$nameWithoutExtension.imageset/$filename ]]; then
                cp $sourceDir/$filename $assetsDir/$nameWithoutExtension.imageset/$filename
            fi
        done
    fi
}

moveAssetImages