最近总是在作的重复性工作，比较两个二进制文件的内容是否一致。。Orz

chunkCmp.sh

#!/bin/bash
s1=`du -b $1|cut -f1`
s2=`du -b $2|cut -f1`
min=$(($s1 < $s2 ? $s1 : $s2 ))
if [ $min -eq $s1 ]; then
    dd if=$2 of=temp bs=$min count=1 >& /dev/null
    echo $1 is smaller and its md5sum is:
    echo $(md5sum $1)
    echo cut $2 to $1\'s size and its md5sum is:
else 
    dd if=$1 of=temp bs=$min count=1 >& /dev/null
    echo $2 is smaller and its md5sum is:
    echo $(md5sum $2)
    echo cut $1 to $2\'s size and its md5sum is:
fi
echo $(md5sum temp)
rm temp