permission error ?

[Abhishek Kumar]

    I wanted to use the ctrl-alt-del sequence to shutdown my system and
only changed the following entry in my /etc/inittab:
    from        ca::ctrlaltdel:/sbin/shutdown -t3 -r  now
    to             ca::ctrlaltdel:/sbin/shutdown -t3 -h now

But after I made this change, the sequence stopped working at all(even
after I changed it back). Can there be a problem with setting file
permission? Currently it is     -rw-r--r--

    What should I change? Thanks for answering.