Move target (file or directory) to trash folder, keeping directory structure

trashit.sh

#!/usr/bin/env bash
#
# Trash It
# Move target (file or directory) to trash folder, keeping directory structure.
# This aims to be an ersatz recycle bin.
#
# Author : Vincent Paré
#
# Usage:
#    trashit <trashfolder> <target>
# Example :
#    find . -type d -iname *toDelete* | xargs -I{} trashit .trash {}

# Help message
usage() {
    echo "Usage: $0 [trashfolder] [target]"
}

if [[ "$1" == "-h" ]] || [[ "$1" == "--help" ]]; then
    usage
    exit
fi

# Arguments check
if [ ! "$1" ] || [ ! "$2" ]; then
    [ "$1" ] || >&2 echo "Missing arg 1"
    [ "$2" ] || >&2 echo "Missing arg 2"
    usage
    exit 1
fi

if [[ "$1" == *".."* ]] || [[ "$2" == *".."* ]]; then
    >&2 echo '[trashfolder] and [target] cannot contain ".."'
    exit 2
fi

# Checking trash directory
if [ ! -d "$1" ]; then
    >&2 echo "Trash directory does not exists ($1)"
    exit 3
fi

# Checking target
if [ ! -d "$2" ] && [ ! -f "$2" ]; then
    >&2 echo "target ($2) does not exists"
    exit 4
fi

parentdir=`dirname "$2"`
trashdir="$1/$parentdir"
itemname=`basename "$2"`
trashpath="$trashdir/$itemname"

# No clobber
if [ -d "$trashpath" ] || [ -f "$trashpath" ]; then
    >&2 echo "Target path already exists into trash ($trashpath)"
    exit 5
fi

# Creating tree into trash
if [ ! -d "$trashdir" ]; then
    mkdir -p "$trashdir"
fi

# Moving target to trash
mv -nv "$2" "$trashdir"
exit 0