Remove all files except a file generated latest

[file system]

Hi all.
It's been a nice day.

it is very sticky problem. can you give tips?
I'm going to remove oracle archive log file but generated lastet log file before file system is going to be full.

I'm going to post shell prg related job above,
and give me the solution which is fit for that job.

*Shell #1

#DELETING ARCHIVE LOG.
df -k > c
value=`awk '/\/arch_ispbs/ {print $3}' c`
str=`ps -e|grep save|awk '{print $4}'`
if [ $value -gt 4242880 -a -z "$str" ]; then
(/usr/bin/sh /d) > /dev/null 2>&1
fi
============================================
*Shell #2

touch /arch_ispbs/temp
save -s online -b oracle -l full /arch_ispbs
find /arch_ispbs ! -newer /arch_ispbs/temp |xargs rm

[RAC_1]

last_file=$(ls -1tr|tail -1)
echo "Removing all others files now"
find . -type f ! -name "${last_file}" -exec ll -d {} \;
ll ${last_file}

Check this first and then replce -exec ll -d {} with -exec rm {}

[file system]

Thank you RAC .
I got your help and, editted the shell progrm like this.

#1. Save file before remove all file.
save -s online -b oracle -l full /arch_ispbs

#2. Generate latest file
last_file=`find /arch_ispbs |ls -1|tail -1`

#3. And then remove except latest file had above line

find /arch_ispbs ! -name $last_file|xargs rm

Owe to you, I have glad morning. Thank you