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Newbie here. any help would be appreciated..
I am writing a cgi script that runs a tcp pcap diagnostic tool. if I would run the command in bash it would look like:
/home/fsoft/cap/capnostic -r 38350 /home/fsoft/brad.pcap > 38350
So I am trying to do it in python:
output = os.system('/home/fsoft/cap/capnostic -r' + port + directory+filename '>' + jobdir+filename
I have a feeling the '>' is messing things up.. But I can't seem to find the right syntax.. Also once I get the command correctly will I just be able to print the output variable?
print '%s' % (output)
the output may be 3 pages of data..
Thanks for the help.
Here is my full code:
#!/usr/bin/env python
import cgi, os
import cgitb; cgitb.enable()
import subprocess
form = cgi.FieldStorage()
port = form.getvalue("port")
filename = form.getvalue("filename")
directory = form.getvalue("directory")
jobdir = '/var/www/jobs/' + filename
def createdir():
os.system('mkdir /var/www/jobs/' + filename)
createdir()
def capout():
output = os.system('/home/fsoft/cap/capnostic -r %s %s%s > %s%s' % (port, directory, filename, jobdir, filename))
capout()
def htmlout():
print 'Content-type: text/html\n'
print '<html>'
print '<head>'
print '<title>Capnostic Output</title>'
print '</head>'
print '<body>'
print '<BR><BR><BR><center>'
print '<table border=0>'
print '<TR>'
print '<TD><center>port = %s<BR>filename = %s<BR>Directory = %s<BR>Job Directory = %s</TD>' % (port,filename,directory,jobdir)
print '</TR>'
print '</table>'
print '<BR><BR><BR>'
print '%s' % (output)
print '</body>'
print '</html>'
htmlout()
It is now telling me:
<type 'exceptions.NameError'>: global name 'output' is not defined
args = ("global name 'output' is not defined",)
message = "global name 'output' is not defined"
315
asked May 24 '26 00:05
You are missing a + for concatenating your string and the spaces between your strings. You can use string formatting to simplify the task or just add a + and spaces where needed:
output = os.system('/home/fsoft/cap/capnostic -r %s %s%s > %s%s' % (port,
directory, filename, jobdir, filename))
Note: %s is used to treat each variable as a string.
Usage of os.system is replaced with the subprocess module:
sts = os.system("mycmd" + " myarg")
# becomes
sts = call("mycmd" + " myarg", shell=True)
To capture the output, you will want to use Popen, which would be translated as follows:
def capout():
cmd = '/home/fsoft/cap/capnostic -r %s %s%s > %s%s' % (port,
directory, filename, jobdir, filename)
process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, error = process.communicate()
return output
output = capout()
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