通过调用unix-shell命令在python中进行Sftp

Question

我们如何通过使用os.system在python脚本中调用unix shell命令将文件从源主机ftp发送到python中的目标服务器...请帮助

I have tried the following code

dstfilename="hi.txt"
host="abc.com"
user="sa"

os.system("echo cd /tmp >sample.txt)
os.system("echo put %(dstfilename)s" %locals())  // line 2 
os.system("echo bye >>sample.txt")
os.system("sftp -B /var/tmp/sample.txt %(user)s@%(host)s)


How to append this result of line to sample.txt?
os.system("echo put %(dstfilename)s %locals()) >>sample.txt" // Seems this is syntatically not correct.

cat>sample.txt      //should look like this
cd /tmp
put /var/tmp/hi.txt
bye

Any help?

Thanks you

Answer 1

您应该将命令传递到中sftp。尝试这样的事情：

import os
import subprocess

dstfilename="/var/tmp/hi.txt"
samplefilename="/var/tmp/sample.txt"
target="sa@abc.com"

sp = subprocess.Popen(['sftp', target], shell=False, stdin=subprocess.PIPE)

sp.stdin.write("cd /tmp\n")
sp.stdin.write("put %s\n" % dstfilename)
sp.stdin.write("bye\n")

[ do other stuff ]

sp.stdin.write("put %s\n" % otherfilename)

[ and finally ]

sp.stdin.write("bye\n")
sp.stdin.close()

但是，为了回答您的问题：

os.system("echo put %(dstfilename)s %locals()) >>sample.txt" // Seems this is syntatically not correct.

当然不是。您想将字符串传递给os.system。所以它必须看起来像

os.system(<string expression>)

以a )结尾。

字符串表达式由具有应用%格式的字符串文字组成：

"string literal" % locals()

字符串文字包含shell的重定向：

"echo put %(dstfilename)s >>sample.txt"

并在一起：

os.system("echo put %(dstfilename)s >>sample.txt" % locals())

。但是正如我所说，这是我能想到的最糟糕的解决方案-更好地直接写入临时文件，甚至更好地通过管道直接进入子进程。