Emergency UNIX and Linux Support

usage() { 
  echo "Usage: $0 mountpoint threshold "
  echo "   where threshold is 1 to 100"
}

# $1 is the mountpoint
# $2 is the threshold (whole number, 1 to 100)

if [ ! -d $1 ]; then
  usage; exit 2;
fi
if [ $2 -lt 1 -o $2 -gt 100 ] ;then
  usage; exit 2;
fi

df -k $1 |
 awk -v t=$2     'NR==2  { print int($4 * (t-int($5))/100 ); }'  |
{
# The pipe-brace here in ksh isn't necessary, but in other sh-based shells, it is.
# 
read blocks
if [ -z $blocks -o $blocks -le 0 ] ; then
   echo "Error: Disk is already filled above threshold!"
   exit 1
else
   dd if=/dev/zero of=$1/.fillfile.$$ bs=1k count=$blocks
   exit $?
fi
}

df -k $1 |  awk -v t=$2  'NR==2  { print int($4 * (t-int($5))/100 ); }'  |
{ read blocks;  dd if=/dev/zero of=$1/.fillfile.$$ bs=1k count=$blocks }

df -k |  awk -v t=$2  'NR>1  { print $NF,int($4 * (t-int($5))/100 ); }'  |
while read mountpoint blocks;  dd if=/dev/zero of=$mountpoint/.fillfile.$$ bs=1k count=$blocks ; done