Stripping arguments from a bash script

I've always avoided bash-isms like arrays or slices, but I found this non-portable script interesting. I needed to strip a option and it's value because the caller couldn't be modified. 
#!/bin/bash

# This script filters out "-expire X" from gskcmd and passes it down
# to "gskcmd.real"

# Get absolute install root the hokey portable way
dir=`dirname $0`
CUR_DIR=`pwd`
IHS_DIR=`dirname ${0}`
cd ${IHS_DIR}
SR=`pwd`
cd ${CUR_DIR}

if echo "$@" | grep -- -expire > /dev/null; then
  COUNTER=1
  while [  $COUNTER -lt $# ]; do
    eval VAL=\$$COUNTER
    if [ "$VAL" =  "-expire" ];  then
      set -- "${@:1:COUNTER-1}" "${@:COUNTER+2}"
      break
    fi
    let COUNTER=COUNTER+1
  done
fi

exec $IHS_DIR/gskcmd.real "$@"

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