I thought of adding the following unix shell script I used  to reduce Log file sizes to zero for Access Manager.
The input to the script is '/var/opt/SUNWam', if it is a standard install.

 #!/bin/sh
clear
echo ""
indir=$1
echo "Input variable : "$1
echo ""
cd $indir/debug
for filename in *
do
 if [ -f $filename ] ; then
   cat /dev/null > $filename
   echo "File size "$filename "made 0";
  fi
done
cd $indir/debug/amadmincli
echo ""
echo "In amadmincli directory ..."
echo ""
for filename1 in *
do
 if [ -f $filename1 ] ; then
  cat /dev/null > $filename1
  echo "File size "$filename1 "made 0";
 fi
done
cd $indir/logs
echo ""
echo "In logs directory ..."
echo ""
for filename2 in *
do
 if [ -f $filename2 ] ; then
  cat /dev/null > $filename2
  echo "File size "$filename2 "made 0";
 fi
done
cd /opt/utils