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In the foregoing section, we used routines in Python's subprocess module to directly invoke commands. This was great, and let us pass characters that would have been special to a normal interactive shell. If you have a big list of file names with spaces and other special characters in them, it can be wonderful to simply pass them into a subprocess call and have the command on the receiving end understand you perfectly. But when you are using remote-shell protocols over the network (which, you will recall, is the subject of this chapter!), you are generally going to be talking to a shell like bash instead of getting to invoke commands directly like you do through the subprocess module. This means that remote-shell protocols will feel more like the system() routine from the os module, which does invoke a shell to interpret your command line, and therefore involves you in all of the complexities of the Unix command line: >>> import os >>> os.system('echo *') Makefile chapter-16.txt formats.ini out.odt source tabify2.py test.py Of course, if the other end of a remote-shell connection is using some sort of shell with which you are unfamiliar, there is little that Python can do. The authors of the Standard Library have no idea how, say, a Motorola DSL router's Telnet-based command line might handle special characters, or even whether it pays attention to quotes at all. But if the other end of a network connection is a standard Unix shell of the sh family, like bash or zsh, then you are in luck: the fairly obscure Python pipes module, which is normally used to build complex shell command lines, contains a helper function that is perfect for escaping arguments. It is called quote, and can simply be passed a string: >>> from pipes import quote >>> print quote("filename") filename >>> print quote("file with spaces")
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CHAPTER 16 TELNET AND SSH
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'file with spaces' >>> print quote("file 'single quoted' inside!") "file 'single quoted' inside!" >>> print quote("danger!; rm -r *") 'danger!; rm -r *' So preparing a command line for remote execution generally just involves running quote() on each argument and then pasting the result together with spaces. Note that using a remote shell with Python does not involve you in the terrors of two levels of shell quoting! If you have ever tried to build a remote SSH command line that uses fancy quoting, by typing a local command line into your own shell, you will know what I am talking about! The attempt tends to generate a series of experiments like this: $ echo $HOST guinness $ ssh asaph echo guinness $ ssh asaph echo asaph $ ssh asaph echo guinness $ ssh asaph echo $HOST $ ssh asaph echo \guinness
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$HOST \$HOST \\$HOST \\\$HOST \\\\$HOST
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Every one of these responses is reasonable, as you can demonstrate to yourself if you first use echo to see what each command looks like when quoted by the local shell, then paste that text into a remote SSH command line to see how the processed text is handled there. But they can be very tricky to write, and even a practiced Unix shell user can guess wrong when he or she tries to predict what the output should be from the foregoing series of commands! Fortunately, using a remote-shell protocol through Python does not involve two levels of shell like this. Instead, you get to construct a literal string in Python that then directly becomes what is executed by the remote shell; no local shell is involved. (Though, of course, you have to be careful if any string literals in your Python program include backslashes, as usual!) So if using a shell-within-a-shell has you convinced that passing strings and file names safely to a remote shell is a very hard problem, relax: no local shell will be involved in our following examples.
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