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用于下载一组文件的 FTP 脚本

tag-icon • tag-icon ftp scripting
用于下载一组文件的 FTP 脚本

我需要一个 FTP 脚本来从 FTP 服务器下载所有文件，然后在完成后删除这些文件，但如果在下载过程中添加了任何文件，则将其保留在远程服务器上，以便在以后的会话中获取。

是否可以使用 FTP 脚本实现这样的功能，或者我是否需要其他解决方案。

我原本打算使用 psftp。

答案1

基于麦克斯韦回答这个问题，我可能会做一些类似于这个伪代码的事情：

用于$favorite_scripting_language收集要下载的文件名列表，然后终止；写入script.txt以以下形式命名的输出文件：

cd /source/directory
lcd c:\target\directory
get foo.bar
delete foo.bar
<<lather, rinse, repeat>>

然后用以下语句结束：

psftp.exe username@server -be -pw user_password -b c:\script.txt

答案2

那 Python 呢？优点是它应该可以在任何操作系统上几乎不加修改地运行。更大的优点是它比使用其他更脆弱的方法更灵活。

它会是这样的：

from ftplib import FTP
import os

ftp = FTP("server")
ftp.login("id", "passwd")
ftp.cwd("/server/ftpdir/")

#copy every file as usual to local system
filelist = []
ftp.retrlines('LIST', filelist.append)
### the list filelist will have one element per file
### which you will have to cut up into the proper pieces
### among Python's installed files on your system is 
### the script Tools/scripts/ftpmirror.py which has such code
### it starts at around line 140 (for python 2.6.1) 
### --- not very long but this margin is too small to contain it
### assume the file names are in dictionary filedict
### keys are filenames and values are file sizes
for fname in filedict.keys():
   localfname = os.path.join(localdir, fname) # set localdir to cwd or whatever
   lf = open(localfname , "wb")
   ftp.retrbinary('RETR ' + fname, lf.write)
   lf.close()
#refresh remote directory listing into filedict2 as with previous filedict
for fname in filedict2.keys():
   if fname not in filedict:
       # new file since download started! ignore. it's for later
       pass
   else:
       if filedict[fname] == filedict2[fname]:
          # apparently we got a good copy so delete the file on ftp server
          ftp.delete(fname)
       else:
          # delete local file: remote was being uploaded or something
          os.unlink(os.path.join(localdir, fname))

您必须添加错误检查和其他类似的东西。使用 perl 可以完成相同的操作，并且看起来可能差不多。

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