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Presupposing ksh, check whether DIRECTORY is valid after the read with:

[ -d $DIRECTORY ] || {
echo bad directory $DIRECTORY
exit
}

# then change to the target directory
cd...

Even if the filesystem isn't mounted your check of it (ls -ltr) will succeed. In other words, the mount *point* probably exists regardless of whether the filesystem is mounted or not.

If you want...

Or do it all in one go

find <the path you want to check> -ctime -60 -exec rm {} \;

You would want to be very, very sure of where you run this, as most operating system files would be older...

ksh because it works on every posix compliant Unix. I have run ksh scripts *without* modification on Solaris, HP-UX, AIX, Linux (many), Irix, etc.