Bash loops and tests

testfile.sh

#!/bin/bash
FILENAME=$1
for FILENAME in "$@"; do
        if ! [ -e "$FILENAME" ]; then
                echo "File not found ($FILENAME). Skipping..."
        elif [ -d "$FILENAME" ]; then
                ORIG_IFS=$IFS
                IFS=$(echo -en "\n\b")
                for F in $(find "$FILENAME" -type f); do
                        ls -lah $F
                done
                IFS=$ORIG_IFS
        elif [ -f "$FILENAME" ]; then
                ls -lah "$FILENAME"
        else
                echo "Invalid file ($FILENAME). Skipping..."
        fi
done

if ! [ -e "$CONFIG_DIRECTORY" ]; then
	if ! mkdir -p "$CONFIG_DIRECTORY" &> /dev/null; then
		echo "Config directory $CONFIG_DIRECTORY does not exist and could not be created."
		exit 1
	fi
fi