如何用脚本实现分割文件

cheng029

#!/bin/bash

if [ $# -ne 2 ]; then

        echo 'Usage: split file size(in bytes)'

        exit

fi

file=$1

size=$2

if [ ! -f $file ]; then

        echo "$file doesn't exist"

        exit

fi

#TODO: test if $size is a valid integer

filesize=`/bin/ls -l $file | awk '{print $5}'`

echo filesize: $filesize

let pieces=$filesize/$size

let remain=$filesize-$pieces*$size

if [ $remain -gt 0 ]; then

        let pieces=$pieces+1

fi

echo pieces: $pieces

i=0

while [ $i -lt $pieces ];

do

        echo split: $file.$i:

        dd if=$file of=$file.$i bs=$size count=1 skip=$i

        let i=$i+1

done

echo "#!/bin/bash" >; merge

echo "i=0" >;>; merge

echo "while [ $i -lt $pieces ];" >;>; merge

echo "do" >;>; merge

echo " echo merge: $file.$i" >;>; merge

echo " if [ ! -f $file.$i ]; then" >;>; merge

echo " echo merge: $file.$i missed" >;>; merge

echo " rm -f $file.merged" >;>; merge

echo " exit" >;>; merge

echo " fi" >;>; merge

echo " dd if=$file.$i of=$file.merged bs=$size count=1 seek=$i" >;>; merge

echo " let i=$i+1" >;>; merge

echo "done" >;>; merge

chmod u+x merge'

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