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<html>
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Permission is granted to copy, distribute and/or modify this document
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled GNU Free
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Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
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Karl Berry <karl@freefriends.org>
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<head>
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<title>CentOS Artwork Repository - Filesystem: 3.55 trunk/Scripts/Bash/Functions/Shell</title>
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<meta name="description" content="CentOS Artwork Repository - Filesystem: 3.55 trunk/Scripts/Bash/Functions/Shell">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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[ < ]
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[ > ]
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[ << ]
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[Top]
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[Contents]
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[Index]
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[ ? ]
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3.55 trunk/Scripts/Bash/Functions/Shell
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3.55.1 Goals
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This section exists to organize files related to shell
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functionality of <tt>`centos-art.sh'</tt> script.
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3.55.2 Description
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The shell functionality of <tt>`centos-art.sh'</tt> script helps
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you to maintain bash scripts inside repository. For example, suppose
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you've created many functionalities for <tt>`centos-art.sh'</tt> script,
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and you want to use a common copyright and license note for
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consistency in all your script files. If you have a bunch of files,
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doing this one by one wouldn't be a big deal. In contrast, if the
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amount of files grows, updating the copyright and license note for all
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of them would be a task rather tedious. The shell functionality
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exists to solve maintainance tasks just as the one previously
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mentioned.
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When you use shell functionality to update copyright inside
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script files, it is required that your script files contain (at least)
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the following top commentary structure:
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1| #!/bin/bash
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2| #
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3| # doSomething.sh -- The function description goes here.
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4| #
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5| # Copyright
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6| #
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7| # ...
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8| #
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9| # ----------------------------------------------------------------------
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10| # $Id$
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11| # ----------------------------------------------------------------------
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12|
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13| function doSomething {
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14|
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15| }
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Figure 3.4: The functions script base comment structure
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Relevant lines in the above structure are lines from 5 to 9.
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Everything else in the file is left immutable.
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When you are updating copyright through shell
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functionality, the <tt>`centos-art.sh'</tt> script replaces everything
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in-between line 5 --the first one matching <samp>`^# Copyright .+$'</samp>
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string-- and line 9--the first long dash separator matching <samp>`^#
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-+$'</samp>-- with the content of copyright template instance.
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 Caution Be sure to add the long dash separator that matches
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<samp>`^# -+$'</samp> regular expression before the function
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definition. Otherwise, if the <samp>`Copyright'</samp> line is present but no
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long dash separator exists, <tt>`centos-art.sh'</tt> will remove anything
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in-between the <samp>`Copyright'</samp> line and the end of file. This way you
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may lost your function definitions entirely.
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The copyright template instance is created from one copyright template
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stored in the <tt>`Config/tpl_forCopyright.sed'</tt> file. The template
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instance is created once, and later removed when no longer needed. At
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this moment, when template instance is created, the
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<tt>`centos-art.sh'</tt> script takes advantage of automation in order to
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set copyright full name and date dynamically.
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When you use shell functionality to update copyright, the first
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thing <tt>`shell'</tt> functionality does is requesting copyright
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information to user, and later, if values were left empty (i.e., no
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value was typed before pressing RET key), the <tt>`shell'</tt>
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functionality uses its own default values.
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When shell functionality uses its own default values, the final
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copyright note looks like the following:
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1| #!/bin/bash
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2| #
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3| # doSomthing.sh -- The function description goes here.
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4| #
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5| # Copyright (C) 2003, 2010 The CentOS Project
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6| #
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7| # This program is free software; you can redistribute it and/or modify
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8| # it under the terms of the GNU General Public License as published by
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9| # the Free Software Foundation; either version 2 of the License, or
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10| # (at your option) any later version.
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11| #
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12| # This program is distributed in the hope that it will be useful, but
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13| # WITHOUT ANY WARRANTY; without even the implied warranty of
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14| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15| # General Public License for more details.
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16| #
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17| # You should have received a copy of the GNU General Public License
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18| # along with this program; if not, write to the Free Software
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19| # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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20| # USA.
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21| #
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22| # ----------------------------------------------------------------------
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23| # $Id$
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24| # ----------------------------------------------------------------------
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25|
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26| function doSomething {
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27|
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28| }
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Figure 3.5: The function script comment example
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Relevant lines in the above structure are lines from 5 to 22. Pay
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attention how the copyright line was built, and how the license was
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added into the top comment where previously was just three dots.
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Everything else in the file was left immutable.
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To change copyright information (i.e., full name or year information),
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run the shell functionality over the root directory containing
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the script files you want to update copyright in and enter the
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appropriate information when it be requested. You can run the
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shell functionality as many times as you need to.
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To change copyright license (i.e., the text in-between lines 7 and
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20), you need to edit the <tt>`Config/tpl_forCopyright.sed'</tt> file, set
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the appropriate information, and run the shell functionality
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once again for changes to take effect over the files you specify.
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 Important The <tt>`centos-art.sh'</tt> script is released as:
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GNU GENERAL PUBLIC LICENSE
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Version 2, June 1991
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Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Do not change the license information under which <tt>`centos-art.sh'</tt>
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script is released. Instead, if you think a different license must be
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used, please share your reasons at CentOS Developers mailing list.
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3.55.3 Usage
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centos-art sh --update-copyright='path/to/dir'
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centos-art sh --update-copyright='path/to/dir' --filter='regex'
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Use these commands to update copyright information in <samp>`.sh'</samp> files
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under <samp>`path/to/dir'</samp> directory.
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When you provide <samp>`--filter='regex''</samp> argument, the list of files
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to process is reduced as specified in <samp>`regex'</samp> regular expression.
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Inside <tt>`centos-art.sh'</tt> script, the <samp>`regex'</samp> regular
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expression is used in combination with find command to look
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for files matching the regular expression path pattern.
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 Warning In order for <samp>`regex'</samp> regular expression to match
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a file, the <samp>`regex'</samp> regular expresion must match the whole file
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path not just the file name.
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For example, if you want to match all <tt>`render.conf.sh'</tt> files
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inside <tt>`path/to/dir'</tt>, use the .+/render.conf regular
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expression. Later, <tt>`centos-art.sh'</tt> script uses this value inside
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^$REGEX\.sh$ expression in order to build the final regular
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expression (i.e., ^.+/render.conf\.sh$) that is evaluated
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against available file paths inside the list of files to process.
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Exceptionally, when you provide <samp>`--filter='regex''</samp> in the way
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that <samp>`regex'</samp>, appended to <samp>`path/to/dir/'</samp> (i.e.
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<samp>`path/to/dir/regex'</samp>), matches a regular file; the
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<tt>`centos-art.sh'</tt> script uses the file matching as only file in the
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list of files to process.
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3.55.4 See also
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3.47 trunk/Scripts/Bash
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3.48 trunk/Scripts/Bash/Functions
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[ < ]
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[ > ]
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[ << ]
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[ Up ]
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[ >> ]
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<font size="-1">
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This document was generated on February, 27 2011 using texi2html 1.76.
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</font>
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</body>
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</html>
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