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哈哈，试验成功了，效果还不错！！
#SubtitleServer autoupdate script.
#author:zhangshaoyan #date:January 14,2016. LocalAppFile=SubtitleServer_Local LocalMD5File=${LocalAppFile}.md5 RemoteAppFile=SubtitleServer RemoteMD5File=${RemoteAppFile}.md5 FTPServer=172.23.142.82 #download md5 file from server. ftp -n <<EOF open $FTPServer user root root binary get $RemoteMD5File close bye EOF #check local md5 file. if [ ! -f $LocalMD5File ];then echo "can't find $LocalMD5File !" exit -1 fi #check download success or not. if [ ! -f $RemoteMD5File ];then echo "Can't find $RemoteMD5File !" exit -1 fi #extract two md5 values. LocalMD5Value=$(cat $LocalMD5File | awk '{print $1}') RemoteMD5Value=$(cat $RemoteMD5File | awk '{print $1}') echo "LocalMD5:" $LocalMD5Value echo "RemoteMD5:" $RemoteMD5Value #compare two md5 values. if [ ${LocalMD5Value} = ${RemoteMD5Value} ];then echo "No need to update,exit" exit 0 fi echo "execute update process..." #backup current version. mv $LocalAppFile ${LocalAppFile}.backup mv $LocalMD5File ${LocalMD5File}.backup #download new version from ftp server. ftp -n <<EOF open $FTPServer user root root binary get $RemoteAppFile get $RemoteMD5File close bye EOF #add executive permission. chmod +x $RemoteAppFile #fix its name. mv $RemoteAppFile $LocalAppFile mv $RemoteMD5File $LocalMD5File echo "update done!" #this is the end of file. 下面是试验结果：shell.albert@zhangshaoyan:~/project/NXPiMX53/SubtitleServer/update> ls
autoupdate.sh SubtitleServer_Local SubtitleServer_Local.md5 shell.albert@zhangshaoyan:~/project/NXPiMX53/SubtitleServer/update> ./autoupdate.sh Connected to 172.23.142.82. 220 Operation successful 230 Operation successful Remote system type is UNIX. Using binary mode to transfer files. 200 Operation successful local: SubtitleServer.md5 remote: SubtitleServer.md5 229 EPSV ok (|||57693|) 150 Opening BINARY connection for SubtitleServer.md5 (49 bytes) 100% |*************************************************************************************************| 49 736.17 KiB/s 00:00 ETA 226 Operation successful 49 bytes received in 00:00 (341.79 KiB/s) Can't parse time `19700001032226'. 221 Operation successful LocalMD5: 335c6c59831f093a276391d89f08126d RemoteMD5: bd0940afc3bd94262d9f076d27d2ccd6 execute update process... Connected to 172.23.142.82. 220 Operation successful 230 Operation successful Remote system type is UNIX. Using binary mode to transfer files. 200 Operation successful local: SubtitleServer remote: SubtitleServer 229 EPSV ok (|||51800|) 150 Opening BINARY connection for SubtitleServer (1047787 bytes) 100% |*************************************************************************************************| 1023 KiB 11.21 MiB/s 00:00 ETA 226 Operation successful 1047787 bytes received in 00:00 (11.20 MiB/s) Can't parse time `19700001025835'. local: SubtitleServer.md5 remote: SubtitleServer.md5 229 EPSV ok (|||35470|) 150 Opening BINARY connection for SubtitleServer.md5 (49 bytes) 100% |*************************************************************************************************| 49 1.06 MiB/s 00:00 ETA 226 Operation successful 49 bytes received in 00:00 (455.72 KiB/s) Can't parse time `19700001032226'. 221 Operation successful update done! shell.albert@zhangshaoyan:~/project/NXPiMX53/SubtitleServer/update> echo $? 0 shell.albert@zhangshaoyan:~/project/NXPiMX53/SubtitleServer/update>转载地址：http://aczji.baihongyu.com/