fix(README):Remove second title and clean up Usage

[BK-2020-04.git] / README.org

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 * BK-2020-04: Baltakatei Engineering Drawing Templates
+#+AUTHOR: Steven Baltakatei Sandoval
+#+DATE: 2023-08-19
+#+EMAIL: baltakatei@gmail.com
 
 ** Scope
-
 This repository contains drawing files for constructing personal P&IDs
-(Process and Instrumentation Diagrams) and PFDs (Process Flow
-Diagrams).
+([[https://en.wikipedia.org/wiki/Piping_and_instrumentation_diagram][Piping and Instrumentation Diagrams]]) and PFDs ([[Process flow diagram][Process Flow
+Diagrams]]).
 
-** Directories
+** Summary
+See the [[File:REVISION.org][drawing revision history]] for a list of tracked files.
+
+Some drawings may be uploaded to Wikimedia Commons. Notable sets include:
+
+- [[https://commons.wikimedia.org/wiki/File:Technical_drawing_templates_(ISO_5457_1999_Sizes_A0-A4).pdf][BK-2020-04-PID-1]]: Chemical engineering symbols ([[https://en.wikipedia.org/wiki/ISO_10628][ISO 10628]]-2:2012 Symbols)
+- [[https://commons.wikimedia.org/wiki/File:Technical_drawing_templates_(ISO_5457_1999_Sizes_A0-A4).pdf][BK-2020-04-TMP-1]]: Technical drawing templates (ISO 5457:1999 Sizes A0—A4)
 
-*** [[./DEL/][~DEL/~]] : Deliverables
+** Directories
+*** [[File:DEL][~DEL~]] : Deliverables
 May include drawings exported into PDF format.
-*** [[.DWG/][~DWG/~]] : Drawing source files
-May include Inkscape SVG files.
-*** [[./IMG/][~IMG/~]] : Reference image files
+*** [[File:DWG][~DWG~]] : Drawing source files
+May include [[https://inkscape.org/][Inkscape]] SVG files.
+*** [[File:EXEC][~EXEC~]]: Executable files
+May include scripts useful for manipulating files.
+*** [[File:IMG][~IMG~]] : Reference image files
 May include various image files used in creation of project source
 files.
 
+** Usage
+*** Generate a combined PDF
+A script is available at ~./EXEC/combine_pdfs.sh~ to merge multiple
+single-page PDFs into a single PDF file; the script uses the [[https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/][~pdftk~
+utility]] available on typical [[https://www.debian.org/][Debian]]-based [[https://en.wikipedia.org/wiki/Gnu-Linux][GNU/Linux]] machines
+of 2023. On a typical Debian 12 system, the following command may be
+used to merge ~input1.pdf~ and ~input2.pdf~ files into ~output.pdf~.
 
-** License
+: $ /bin/bash combine_pdfs.sh output.pdf input1.pdf input2.pdf
 
+** License
 Unless otherwise specified, source and deliverable files are copyright
-2020 [[http://baltakatei.com][Steven Baltakatei Sandoval]] and available under a [[https://creativecommons.org/licenses/by-sa/4.0/][CC BY-SA 4.0]]
+2023 [[https://baltakatei.com][Steven Baltakatei Sandoval]] and available under a [[https://creativecommons.org/licenses/by-sa/4.0/][CC BY-SA 4.0]]
 license.