ok, problem solved (well, partly - at least as much as I need it to be).
status = os.system('ps') doesn't set status equal to the output text, it sets it to the return of the call (in this case '0'). What I really want to do is
status = os.popen('ps').read()
print statuswhich works fine. However, why the first version confused the web server I don't know, I guess the output from ps went somewhere it wasn't supposed to.
nik
Nik wrote:
no luck I'm afraid.
Also, to make it even more annoying, omitting the os call and going for
#!/usr/bin/python
import cgitb; cgitb.enable()
print "Content-type: text/plain\n\n" import os
status = """PID TTY TIME CMD 3649 pts0 00:00:00 su 3652 pts0 00:00:00 bash 5197 pts0 00:00:00 ps """ print status
works fine.
I've already half a dozen other scripts happily querying a database but this is the first one to have an error outside the usual brain fart stuff.
nik
Kent Johnson wrote:
Nik wrote:
hi,
I'm trying to write a python cgi script that can control certain processes on my server, but I'm having some trouble.
The script is;
#!/usr/bin/python
import cgitb; cgitb.enable()
print "Content-type: text/plain\n\n"
You may need explicit \r\n here, I'm not sure:
print "Content-type: text/plain\r\n\r\n"
Kent
import os cmd = "/bin/ps" status = os.system(cmd) print status
which seems straight forward, but I get a server error, and
malformed header from script. Bad header= PID TTY TIME CMD:
appears in the apache logs. The PID TTY etc indicates it's getting the ps response, but why won't it display (even with text/plain)?
Ultimately I'll have the content type as html, and I'm going to preprocess the output of ps so it probably won't cause any problems, but I just don't understand why this isn't working in its simple form?
btw, the final idea is to list the processes corresponding to a certain name, and allow users to stop them or create new ones. I'm assuming this should be do-able?
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