bashin implemented in bash

bashin.sh

#!/bin/bash
FILE=$1

[[ ! -f $FILE ]] && exit 1

function create_args() {
    while [[ $# -gt 1 ]]; do
        shift
        echo -n " \"$1\""
    done
}

ARGS=$(create_args "$@")
PROGRAM=$(base64 < $FILE | tr -t '\n' '')

cat <<ENDL
#!/bin/bash
EXEC=/tmp/.exec.\$\$;
base64 -id <<< "$PROGRAM" > \$EXEC;
chmod +x \$EXEC;
\$EXEC$ARGS;
ENDL