On Thu, 9 Jun 2022 at 03:15, <2qdxy4rzwzuui...@potatochowder.com> wrote:
>
> On 2022-06-08 at 08:07:40 -0000,
> De ongekruisigde <ongekruisi...@news.eternal-september.org> wrote:
>
> > Depending on the problem a regular expression may be the much simpler
> > solution. I love them for e.g. text parsing and use them all the time.
> > Unrivaled when e.g. parts of text have to be extracted, e.g. from lines
> > like these:
> >
> > root:x:0:0:System administrator:/root:/run/current-system/sw/bin/bash
> > dhcpcd:x:995:991::/var/empty:/run/current-system/sw/bin/nologin
> > nm-iodine:x:996:57::/var/empty:/run/current-system/sw/bin/nologin
> > avahi:x:997:996:avahi-daemon privilege separation
> > user:/var/empty:/run/current-system/sw/bin/nologin
> > sshd:x:998:993:SSH privilege separation
> > user:/var/empty:/run/current-system/sw/bin/nologin
> > geoclue:x:999:998:Geoinformation
> > service:/var/lib/geoclue:/run/current-system/sw/bin/nologin
> >
> > Compare a regexp solution like this:
> >
> > >>> g = re.search(r'([^:]*):([^:]*):(\d+):(\d+):([^:]*):([^:]*):(.*)$' ,
> > s)
> > >>> print(g.groups())
> > ('geoclue', 'x', '999', '998', 'Geoinformation service',
> > '/var/lib/geoclue', '/run/current-system/sw/bin/nologin')
> >
> > to the code one would require to process it manually, with all the edge
> > cases. The regexp surely reads much simpler (?).
>
> Uh...
>
> >>> import pwd # https://docs.python.org/3/library/pwd.html
> >>> [x for x in pwd.getpwall() if x[0] == 'geoclue']
> [pwd.struct_passwd(pw_name='geoclue', pw_passwd='x', pw_uid=992,
> pw_gid=992, pw_gecos='Geoinformation service', pw_dir='/var/lib/geoclue',
> pw_shell='/sbin/nologin')]
That's great if the lines are specifically coming from your system's
own /etc/passwd, but not so much if you're trying to compare passwd
files from different systems, where you simply have the files
themselves.
ChrisA
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