A shell script to copy txt files

copy_txt_files.sh

if [ $# -ne 2 ]; then
    echo "Invalid parameters! Use: $0 <origem> <destination>"
    exit 1
fi

origen="$1"
destination="$2"

# check if origen directory exits
if [ ! -d "$origen" ]; then
    echo "Origem directory do not exists"
    exit 1
fi

# check if exists files in origen directory
files=( $(find "$origen" -maxdepth 1 -type f -name "*.txt") )

if [ ${#files[@]} -eq 0 ]; then
    echo "Not exits files to copy in this origen directory."
    exit 1
fi

# check if destination directory exits and create one if not
if [ ! -d "$destination" ]; then
    mkdir -p "$destination"
fi

# check if origem not equal to destination
if [ "$origen" -ef "$destination" ]; then
    echo "Error: origen and destination are the same directory."
    exit 1
fi

cp "$origen"/*.txt "$destination"

# check if copy has been sucessfull
if [ $? -eq 0 ]; then
    echo "Copy files finished with success."

    # Ask about files exclusion from origem folder
    read -p "You want to exclude the files from origem? (y/n): " confirmation

    while [[ ! $confirmation =~ ^[YyNn]$ ]]; do
        read -p "Please, answer only with 'y' for yes or 'n' for not: " confirmation
    done

    if [ "$(echo "$confirmation" | tr '[:upper:]' '[:lower:]')" = "y" ]; then
        rm "$origen"/*.txt
        echo "Files succesfull excluded."
    else
        echo "Files not excluded."
    fi
else
    echo "Fail during the copy of files."
fi