cat test_unshift
#!/bin/sh
echo "Initial args:" "$@"
COMMANDLINE="$@"
shift
shift
echo "After 2 shifts :" "$@"
set -- $COMMANDLINE
echo "After unshift:" "$@"


$ sh test_unshift 1 2 3 4 5 6 7
Initial args: 1 2 3 4 5 6 7
After 2 shifts : 3 4 5 6 7
After unshift: 1 2 3 4 5 6 7