example call #!/bin/sh float2integer 4.035 4035 our handcrafted testsuite $ ./float2integer.sh input: <empty> => -1 input: .0091234234 => 9 input: 0 => 0 input: 0.0 => 0 input: 0.1 => 100 input: 0.01 => 10 input: 0.001 => 1 input: 0.0001 => 0 input: 0.035267 => 35 input: 4.100820 => 4100 input: 35.0001234234 => 35000 input: 35.0091234234 => 35009 input: 35.1 => 35100 input: 35.12 => 35120 input: 35.02 => 35020 input: 0043.43 => 43430 input: 42 => 42000 a handy (but correct) oneliner in 183 bytes madness x(){ local o r f=${1%.*};r=${1#*.};case ${#r} in 0|3);;1)r=${r}00;;2)r=${r}0;;*)r=${r%${r#???}};esac;o=${f}$r;while case $o in 0[0-9]*):;;*)false;esac;do o=${o#?};done;echo ${o:--1};} x 4.1 4100