A wrapper of init script that does cleaning work and correct the mistyped init-level caused by excitement.

init_repl.sh

#!/bin/sh

##
## This file is for replace the typical init program, do some
## pre-checking work before shutting down or other stuff.
##
## Written by Shou Ya, at 23 June, 2012
##
##


tmp_dir="$HOME/tmp"
original_init="/sbin/init"
default_shell="$SHELL"
[ -z $default_shell ] && default_shell="/bin/bash"
user="shou"

tmp_area_empty_p() {
    [ -z "`ls -A $tmp_dir/ 2>/dev/null`" ]
}

new_shell() {
    old_pwd=`pwd`
    initial_directory="$1"

    cd "$initial_directory"
    echo ""

    sudo -u "$user" "$default_shell"

    cd "$old_pwd"
}

run_level_correct() {
    run_level="$1"
    case $run_level in
	9) echo 0;;
	o) echo 0;;
	*) echo $run_level
    esac
}

orig_init() {
    $original_init "$@"
}

if ! tmp_area_empty_p; then
    echo ">> Note: tmporary area is not empty! <<"
    echo -n "Do you want to check them now? [Yn] "
    read answer
    case $answer in
	N*|n*);;
	*|Y*|y*)
	    echo "Okay, now I'll bring you to the directory."
	    new_shell $tmp_dir
	    tmp_area_empty_p && orig_init `run_level_correct "$@"`
	    exit 0
    ;;
    esac
fi

orig_init `run_level_correct "$@"`