Why does os.stat() tell me that my file-group has no members?
I'm using python 2.6.4 on Solaris 5-10.
I have a file named "myFile". It is owned by someone else, by I ("myuser") am
in the file's group ("mygrp"). Below is my python code. Why does it tell me
that mygrp has no members???
>>> import os, pwd, grp
>>> stat_info = os.stat("myFile")
>>> fileUID = stat_info.st_uid
>>> fileGID = stat_info.st_gid
>>> fileGroup = grp.getgrgid(fileGID)[0]
>>> fileUser = pwd.getpwuid(fileUID)[0]
>>> print "grp.getgrgid(fileGID) = %s" % grp.getgrgid(fileGID)
grp.getgrgid(fileGID) = grp.struct_group(gr_name='mygrp', gr_passwd='',
gr_gid=100, gr_mem=[])
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Re: Why does os.stat() tell me that my file-group has no members?
Thanks!! This was very helpful. It worked perfectly.
I had no clue about the intricacies of how python represents the group data
from the underlying OS.
This page doesn't go into to detailed explanation like you did:
http://docs.python.org/2/library/grp.html
On Wednesday, December 19, 2012 6:17:16 PM UTC-5, Hans Mulder wrote:
> On 19/12/12 22:40:00, saqib.ali...@gmail.com wrote:
>
> >
>
> >
>
> > I'm using python 2.6.4 on Solaris 5-10.
>
> >
>
> > I have a file named "myFile". It is owned by someone else, by
>
> > I ("myuser") am in the file's group ("mygrp"). Below is my python
>
> > code. Why does it tell me that mygrp has no members???
>
> >
>
> >
>
> import os, pwd, grp
>
> stat_info = os.stat("myFile")
>
> fileUID = stat_info.st_uid
>
> fileGID = stat_info.st_gid
>
> fileGroup = grp.getgrgid(fileGID)[0]
>
> fileUser = pwd.getpwuid(fileUID)[0]
>
> print "grp.getgrgid(fileGID) = %s" % grp.getgrgid(fileGID)
>
> >
>
> > grp.getgrgid(fileGID) = grp.struct_group(gr_name='mygrp', gr_passwd='',
> > gr_gid=100, gr_mem=[])
>
>
>
> It doesn't say that your group has no members.
>
>
>
> Every account has a primary group, and some accounts also
>
> have addtional groups. The primary group is the one in the
>
> .pw_gid attribute in the pwd entry. The additional groups
>
> are those that mention the account in the .gr_mem attribute
>
> in their grp entry.
>
>
>
> Your experiment shows that nobody has "mygrp" as an additional
>
> group. So if you're a member of mygrp, then it must be your
>
> primary group, i.e. os.getgid() should return 100 for you.
>
>
>
> You can get a complete list of members of group by adding
>
> two lists:
>
>
>
> def all_members(gid):
>
> primary_members = [ user.pw_name
>
> for user in pwd.getpwall() if user.pw_gid == gid ]
>
> additional_members = grp.getgrgid(gid).gr_mem
>
> return primary_members + additional_members
>
>
>
>
>
> Hope this helps,
>
>
>
> -- HansM
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Why is pexpect acting funny with sendline() and expect()?
I am running Solaris 5-10, python 2.6.2 and pexpect 2.4
I have the very simple python script below which exercises the functionality of
sending and receiving text from the shell.
My understanding is that pexepect([pexpect.TIMEOUT, x,y,z], timeout=w) will
return the index of the match that it found *since the last time pexpect was
called*, but if it takes longer than w seconds, it will return 0.
Here is my very simple script:
#!/usr/bin/env python
import pexpect
myPrompt = " % "
myShell = pexpect.spawn("/bin/tcsh")
print "Sending 'JUNK-0' to shell"
x = myShell.sendline("JUNK-0")
y = myShell.expect([pexpect.TIMEOUT], timeout=1)
print "y = %s" % y
print myShell.before
print "=" * 80
print "\n\n"
for i in range(2):
print "i = %d" % (i+1)
print "Sending 'JUNK-%d' to shell" % (i+1)
x = myShell.sendline("JUNK-%d" % (i+1))
y = myShell.expect([pexpect.TIMEOUT, myPrompt], timeout=10)
print "y = %s" % y
print myShell.before
print "=" * 80
print "\n\n"
FYI, my shell prompt is "myMachine % ", however in this script I have simply
used " % " to keep it generic.
When I run it, I see the following output:
Sending 'JUNK-0' to shell
y = 0
JUNK-0
myMachine % JUNK-0
JUNK-0: Command not found.
myMachine %
i = 1
Sending 'JUNK-1' to shell
y = 1
JUNK-0
myMachine
i = 2
Sending 'JUNK-2' to shell
y = 1
JUNK-0
JUNK-0: Command not found.
myMachine
Why do I see "JUNK-0" consistently recurring in the output? It should be
consumed by the first myShell.expect() statement, but it keeps showing up. Why??
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