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标题: 利用cURL实现单个文件分多段同时下载，支持断点续传 [打印本页]

作者: snowtty 时间: 2007-04-01 08:19
标题: 利用cURL实现单个文件分多段同时下载，支持断点续传
下面是代码：(转自CU)
（俺是新手，高手见笑）
用法：./mycurl url
#!/bin/bash
######################################################################################################
#
# Script for curl to support resumable multi-part download.
#
url=$1
exename=`basename $0`
# How many "parts" will the target file be divided into?
declare -i parts=5
read -ep "Please input the target directory: " targetdir
read -ep "Please input the outfile name: " outfile
[ -z "$targetdir" ] && targetdir="./"
cd $targetdir||exit 2
[ -z "$outfile" ] && outfile=`basename $1`
length=`curl -s -I $url|grep Content-Length|sed s/[^0-9]//g`
#length=`curl -s -I $url|grep Content-Length|awk '{print $2}'|sed s/[^0-9]//`
if [ -z "$length" ]; then
      echo "cann't get the length of the target file"
      exit 1
fi
let "length = $length"
declare -i lsession=$(($length/$parts))
finished="false"
while true;
do
declare -i curr=0
for (( i=1; i> $outfile$i &
            fi
      else
            if [ $offset -lt $(($length-$(($lsession*$(($parts-1)))))) ]; then
                     curl -r $(($curr+$offset))- $url >> $outfile$i &
            fi
      fi

      curr=$(($curr+$lsession))
done
#To judge if all curl threads have terminated.
while true;
do
      hasCurl=`ps -A -o ppid,cmd|grep $$|grep -v "$exename"|grep -v "grep"|grep curl`
      [ -z "$hasCurl" ] && break
      sleep 10
done
finished="true"
for (( i=1; i> $outfile
      rm $outfile$i
done
echo "Done."

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