scripts/_split_file

   1 #!/bin/sh
   2
   3 dir="$1"
   4 file="$2"
   5 #dir=/storage/sdcard0/android
   6 #file=android.zip
   7 [ -z "$dir" -o -z "$file" ] && echo "usage: _split_file 'directory' 'file' parts_num parts_size_in_megabytes" && exit 1
   8
   9 parts="$3"
  10 size="$4"
  11 #parts=5
  12 #size=10
  13 [ -z "$parts" -o -z "$size" ] && echo "usage: _split_file 'directory' 'file' parts_num size" && exit 1
  14 num=0
  15 while true; do
  16
  17     if [ $num = $parts ]; then
  18         break
  19     fi
  20
  21     dd if=${dir}/${file} of=${dir}/${file}.$num bs=${size}M count=1 skip=$num
  22     num=$(expr $num + 1)
  23
  24 done