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Top Forums Programming obtener usuarios de cada grupo en c Post 302352389 by cybermeis on Friday 11th of September 2009 07:12:54 AM
Old 09-11-2009
obtener usuarios de cada grupo en c

Hola

me han encargado que haga varias pequeñas utilidades en C/C++ para los servidores, entre ellos un pequeño programa en C/C++ para generar un fichero html con los grupos de ese servidor y además que se muestren los usuarios correspondientes de ese grupo. Por ejemplo de un grupo:

Grupo : sys
Miembros: root, bin, sys, adm....

y así de todos los grupos.

Y no se como hacerlo, saber los grupos es solo cuestión de leer el fichero /etc/group, pero no encuentro la forma de conocer los miembros de cada grupo.

Se que existen funciones análogas a getpwent, setpwent... para grupos, pero no encuentro ninguna información sobre ellos. Los cuales use para hacer ya otro pequeño programa que genera un html con los datos de todos los usuarios, pero no me sirven para este trabajo en concreto, o por lo menos no se como.

Gracias.
 
XML_GREP(1)						User Contributed Perl Documentation					       XML_GREP(1)

NAME
xml_grep - grep XML files looking for specific elements SYNOPSYS
xml_grep [options] <file list> or xml_grep <xpath expression> <file list> By default you can just give "xml_grep" an XPath expression and a list of files, and get an XML file with the result. This is equivalent to writing xml_grep --group_by_file file --pretty_print indented --cond <file list> OPTIONS
--help brief help message --man full documentation --Version display the tool version --root <cond> look for and return xml chunks matching <cond> if neither "--root" nor "--file" are used then the element(s) that trigger the "--cond" option is (are) used. If "--cond" is not used then all elements matching the <cond> are returned several "--root" can be provided --cond <cond> return the chunks (or file names) only if they contain elements matching <cond> several "--cond" can be provided (in which case they are OR'ed) --files return only file names (do not generate an XML output) usage of this option precludes using any of the options that define the XML output: "--roots", "--encoding", "--wrap", "--group_by_file" or "--pretty_print" --count return only the number of matches in each file usage of this option precludes using any of the options that define the XML output: "--roots", "--encoding", "--wrap", "--group_by_file" or "--pretty_print" --strict without this option parsing errors are reported to STDOUT and the file skipped --date when on (by default) the wrapping element get a "date" attribute that gives the date the tool was run. with "--nodate" this attribute is not added, which can be useful if you need to compare 2 runs. --encoding <enc> encoding of the xml output (utf-8 by default) --nb_results <nb> output only <nb> results --by_file output only <nb> results by file --wrap <tag> wrap the xml result in the provided tag (defaults to 'xml_grep') If wrap is set to an empty string ("--wrap ''") then the xml result is not wrapped at all. --nowrap same as using "--wrap ''": the xml result is not wrapped. --descr <string> attributes of the wrap tag (defaults to "version="<VERSION>" date="<date>"") --group_by_file <optional_tag> wrap results for each files into a separate element. By default that element is named "file". It has an attribute named "filename" that gives the name of the file. the short version of this option is -g --exclude <condition> same as using "-v" in grep: the elements that match the condition are excluded from the result, the input file(s) is (are) otherwise unchanged the short form of this option is -v --pretty_print <optional_style> pretty print the output using XML::Twig styles ('"indented"', '"record"' or '"record_c"' are probably what you are looking for) if the option is used but no style is given then '"indented"' is used short form for this argument is -s --text_only Displays the text of the results, one by line. --html Allow HTML input, files are converted using HTML::TreeBuilder --Tidy Allow HTML input, files are converted using HTML::Tidy Condition Syntax <cond> is an XPath-like expression as allowed by XML::Twig to trigger handlers. exemples: 'para' 'para[@compact="compact"]' '*[@urgent]' '*[@urgent="1"]' 'para[string()="WARNING"]' see XML::Twig for a more complete description of the <cond> syntax options are processedby Getopt::Long so they can start with '-' or '--' and can be abbreviated ("-r" instead of "--root" for example) DESCRIPTION
xml_grep does a grep on XML files. Instead of using regular expressions it uses XPath expressions (in fact the subset of XPath supported by XML::Twig) the results can be the names of the files or XML elements containing matching elements. SEE ALSO
XML::Twig Getopt::Long LICENSE
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. AUTHOR
Michel Rodriguez <mirod@xmltwig.com> perl v5.16.3 2012-05-17 XML_GREP(1)

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