切分日志脚本

主要是使用了dd命令进行了切割

#!/bin/bash
if [ $# -ne 2 ]; then
        echo 'Usage:split file size(in MB)'
        echo "Uselike: $0 file 1M"
        exit
fi
file=$1
let piecesize=$2*1024*1024
filesize=`ls -l $file | awk '{print $5}'`
let piecenum=$filesize/$piecesize
let remain=$filesize-$piecenum*$piecesize
#echo "file size: $filesize"
#echo "piece size: $piecesize"
#echo "remain size: $remain"
if [ $remain -gt 0 ]; then
        let $piecenum=$piecenum+1
fi
#echo "piece num: $piecenum"
i=0
while [ $i -lt $piecenum ]
do
        newname="$file"."$i"
        dd if=$file of=$newname bs=$piecesize count=1 skip=$i > /dev/null 2>&1
        let i=$i+1
done
if [ $# -ge 0 ]; then
        echo "ok"
fi