Ruby way to enumerate users

ruby-talk
1

Hi,
exists there a preferred ruby way to enumerate the
users names and directories?

especially on linux

2

“Robert K.” anon@nospam.de schrieb im Newsbeitrag
news:401d3b89$0$24652$9b4e6d93@newsread2.arcor-online.net…

Hi,
exists there a preferred ruby way to enumerate the
users names and directories?

especially on linux

Maybe something like this

ruby -naF: -e ‘printf “%s\t%s\n”, $F[0], $F[5]’ /etc/passwd

robert
3

“Robert K.” anon@nospam.de schrieb im Newsbeitrag
news:401d3b89$0$24652$9b4e6d93@newsread2.arcor-online.net…

Hi,
exists there a preferred ruby way to enumerate the
users names and directories?

especially on linux

Maybe something like this

ruby -naF: -e ‘printf “%s\t%s\n”, $F[0], $F[5]’ /etc/passwd

robert
4

Maybe something like this

ruby -naF: -e ‘printf “%s\t%s\n”, $F[0], $F[5]’ /etc/passwd

Is this allways applicable? For example in an NIS+ env

  • that’s why I’m asking.

THX

5

Definitely not. NIS, NIS+, NetInfo, non-UNIX POSIX environments, . . .
all sorts of different places the info could be. What is needed is a
Ruby interface to the getpwent() family of system calls.
I don’t see any such thing in the standard library, RAA, or Ruby Forge;
maybe I’m just not looking in the right place, or maybe you have just
discovered your first module project! :slight_smile:

-Mark

···

On Sun, Feb 01, 2004 at 08:43:11PM +0100, Robert K. wrote:

Maybe something like this

ruby -naF: -e ‘printf “%s\t%s\n”, $F[0], $F[5]’ /etc/passwd

Is this always applicable? For example in an NIS+ env

  • that’s why I’m asking.
6

I don’t see any such thing in the standard library, RAA, or Ruby Forge;
maybe I’m just not looking in the right place, or maybe you have just
discovered your first module project! :slight_smile:

Others: Is this the case?
Do I have to or may I develope that module?

···

-Mark

7

require ‘etc’

(Should be in PickAxe, definitely in Nutshell.)

Gavin

···

On Monday, February 2, 2004, 8:14:50 AM, Mark wrote:

On Sun, Feb 01, 2004 at 08:43:11PM +0100, Robert K. wrote:

Maybe something like this

ruby -naF: -e ‘printf “%s\t%s\n”, $F[0], $F[5]’ /etc/passwd

Is this always applicable? For example in an NIS+ env

  • that’s why I’m asking.

Definitely not. NIS, NIS+, NetInfo, non-UNIX POSIX environments, . . .
all sorts of different places the info could be. What is needed is a
Ruby interface to the getpwent() family of system calls.
I don’t see any such thing in the standard library, RAA, or Ruby Forge;
maybe I’m just not looking in the right place, or maybe you have just
discovered your first module project! :slight_smile:

8

What is needed is a Ruby interface to the getpwent() family of system calls.
I don’t see any such thing in the standard library

require ‘etc’

Ah! I don’t know how I would have found that, though, given the name. :slight_smile:

Okay, so enumerating users is easy enough.

require ‘etc’
class Users
include Etc
include Enumerable

def each
    setpwent
    while pw = getpwent
        yield pw
    end
    endpwent
end

end

Users.new.each { |u| puts u.name }

9

Simpler:

require ‘etc’
class Users
include Etc
include Enumerable
alias :each :passwd
public :each
end

Users.new.each { |u| puts u.name }

···

On Mon, 2 Feb 2004 07:54:50 +0900, Mark J. Reed wrote:

Okay, so enumerating users is easy enough.
require ‘etc’
class Users
include Etc
include Enumerable
def each
setpwent
while pw = getpwent
yield pw
end
endpwent
end
end
Users.new.each { |u| puts u.name }

10

require ‘etc’
class Users
include Etc
include Enumerable
def each
setpwent
while pw = getpwent
yield pw
end
endpwent
end
end
Users.new.each { |u| puts u.name }

Simpler:

require ‘etc’
class Users
include Etc
include Enumerable
alias :each :passwd
public :each
end

Simpler, but not equivalent. That version starts wherever the last
call to getpwent passwd left off, instead of starting over at the
first entry.

-Mark

11

Eric Sunshine sunshine@sunshineco.com wrote in message news:200402012329.AA01538@sunshineco.com…

Okay, so enumerating users is easy enough.
require ‘etc’
class Users
include Etc
include Enumerable
def each
setpwent
while pw = getpwent
yield pw
end
endpwent
end
end
Users.new.each { |u| puts u.name }

Simpler:

require ‘etc’
class Users
include Etc
include Enumerable
alias :each :passwd
public :each
end

Users.new.each { |u| puts u.name }

Apparently my earlier message got lost. There is no need to wrap this
with the etc module.

require “etc”
Etc.passwd{ |s|
p s.name
p s.dir
}

This is documented in the Nutshell book and at
http://www.rubygarden.org/ruby?ProgrammingRubyTwo/Etc

Regards,

Dan

···

On Mon, 2 Feb 2004 07:54:50 +0900, Mark J. Reed wrote:

12

And when you pass a block it automatically resets to the first user,
too. Cool. Thanks!

-Mark

···

On Sun, Feb 01, 2004 at 07:33:52PM -0800, Daniel Berger wrote:

Apparently my earlier message got lost. There is no need to wrap this
with the etc module.

require “etc”
Etc.passwd{ |s|
p s.name
p s.dir
}

13

BTW how can I read this book offline?

Gergo

···

On 0202, Daniel Berger wrote:

This is documented in the Nutshell book and at
http://www.rubygarden.org/ruby?ProgrammingRubyTwo/Etc

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14

Something like Httrack will do the trick.

http://www.theopenidea.org/tikiwiki/tiki-index.php?page=HTTrack

Cheers

Rove Monteux

KONTRA Gergely wrote:

···

On 0202, Daniel Berger wrote:

This is documented in the Nutshell book and at
http://www.rubygarden.org/ruby?ProgrammingRubyTwo/Etc

BTW how can I read this book offline?

Gergo

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Systems Administrator

rove.monteux@fluid-rock.com