file size function

fsize.sh

#!/bin/sh
# put this in .bashrc or /etc/bashrc

function fsize() {                                                              
        kB=1000                                                                 
        val=$(stat --printf="%s" $1)                                            
        if [ $val -lt $kB ]; then                                               
                printf "$val B\n"                                                 
        elif [ $val -lt $(($kB*$kB)) ]; then
                printf "%0.2lf KB\n" $(bc -l <<< "$val/$kB")                    
        elif [ $val -lt $(($kB*$kB*$kB)) ]; then                                
                printf "%0.3lf MB\n" $(bc -l <<< "$val/($kB^2)")                
        else                                                                    
                printf "%0.3lf GB\n" $(bc -l <<< "$val/($kB^3)")                
        fi                                                                      
}