regarding popen function

[praba kar]

Dear All,

The following way of popen function usage is
wrong or not kindly give me answer regarding this

time = os.popen("echo %s | tai64nlocal" %
line[2]).read()

Actually here I didn't use any file handler and
I didn't close file handler.

regards
Prabahar







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[Michael Hoffman]

The following way of popen function usage is
wrong or not kindly give me answer regarding this

time = os.popen("echo %s | tai64nlocal" %
line[2]).read()

I don't know, I don't know what tai64nlocal is or what's in line[2].
What happened when you tried it?

Personally I try to use the subprocess module rather than os.popen.

 

[Peter Hansen]

The following way of popen function usage is
wrong or not kindly give me answer regarding this

time = os.popen("echo %s | tai64nlocal" %
line[2]).read()

Did you try it? Just open the Python interactive interpreter and see
what happens:

Python 2.3.4 (#1, Feb 2 2005, 12:11:53)
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)] on linux2

>>> import os
>>> line = ['', '', '@4000000042b40a8716ebce34']
>>> time = os.popen('echo %s | tai64nlocal' % line[2]).read()
>>> time

'2005-06-18 07:50:21.384552500\n'

Or were you just asking if it was an appropriate way of using
os.popen()? If that's what you were asking, it would have been much
clearer not to include the command itself, since clearly it just
confuses people about what you are asking.

Yes, it's an appropriate way to use popen(), and it does seem to work if
you have tai64nlocal in your path.

(Michael, tai64nlocal is a program that converts a special "packed"
timestamp to human-readable form. These timestamps are created, as I
recall, by the multilog program that the developer of Qmail created.)

-Peter

 

[Michael Hoffman]

Michael, tai64nlocal is a program that converts a special "packed"
timestamp to human-readable form.

Thanks Peter. I was asking somewhat rhetorically but I have a love of
UNIX arcana and now I know.