On 08/15/2012 10:22 AM, Tony Molloy wrote:
>
> Hi,
>
> I'm looking for a command to extract lines from a large text file, a
> password file. A typical user has a username made from a letter
> followed by their id-number.
>
> m9718508:pw:9301:840: Lynch :/home/pgstud/m9718508:/bin/bash
>
> So for instance if I need to extract lines where;
>
> the 1st field, the username begins with an m
> and
> the 4th field, the group contains exactly 850
>
> cat passwdfile | grep ^m | grep 850> output
>
> is close but fails if the value 850 appears outside the 4th field. In
> the above example which should be ignored 850 appears in the username
> and home directory and is therefore extracted.
>
> Any ideas.
>
> Thanks,
>
> Tony
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[mlapier@mushroom ~]$ cat tmpfile
m9718508:pw:9301:840: Lynch :/home/pgstud/m9718508:/bin/bash
m1234567:pw:9302:850: Lynch :/home/pgstud/m1234567:/bin/bash
[mlapier@mushroom ~]$ grep ^m tmpfile | grep ":850:"
m1234567:pw:9302:850: Lynch :/home/pgstud/m1234567:/bin/bash
[mlapier@mushroom ~]$
--
_
°v°
/(_)\
^ ^ Mark LaPierre
Registerd Linux user No #267004
www.counter.li.org
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