1# Try to divide the smallest integer by -1. 2# On amd64 this causes SIGFPE, so make sure the shell checks. 3 4# Calculate the minimum possible value, assuming two's complement and 5# a certain interpretation of overflow when shifting left. 6minint=1 7while [ $((minint <<= 1)) -gt 0 ]; do 8 : 9done 10v=$( eval ': $((minint / -1))' 2>&1 >/dev/null) 11[ $? -ne 0 ] && [ -n "$v" ] 12