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Full Discussion: Speeding up a Shell Script (find, grep and a for loop)
Top Forums UNIX for Dummies Questions & Answers Speeding up a Shell Script (find, grep and a for loop) Post 302221796 by Dave Stockdale on Tuesday 5th of August 2008 08:05:41 AM
Old 08-05-2008
Speeding up a Shell Script (find, grep and a for loop)
Hi all,

I'm having some trouble with a shell script that I have put together to search our web pages for links to PDFs.

The first thing I did was:

Code:
ls -R | grep .pdf > /tmp/dave_pdfs.out

Which generates a list of all of the PDFs on the server. For the sake of arguement, say it looks like this:

file1.pdf
file2.pdf
file3.pdf
file4.pdf

I then put this info into an array in a shell script, and loop through the array, searching all .htm and .html files in the site
for the value:

Code:
# The Array
pdfs=("file1.pdf" "file2.pdf" "file3.pdf" "file4.pdf")

# Just a counter that gets incremented for each iteration
counter=1

# For every value in the array
for value in ${pdfs[@]}
do

# Tell the user which file is being searched for, and how far along in the overall process we are.
echo "Working on $value..."
echo "($counter of ${#pdfs[*]})"

# Add what is being searched for to the output file
echo "$value is linked to from" >> /tmp/dave_locations.out

# Find all .htm and .html files with the filename we are looking for in, and add it to the output file
find . -name "*.htm*" -exec grep -l $value {} \; >> /tmp/dave_locations.out

# Adding a space afterwards
echo " " >> /tmp/dave_locations.out

# Increment the counter.
counter=`expr $counter + 1`

done

This does work.

However, our site is huge (1491 PDFs, and a whole lot of .htm and .html pages). Each iteration through the loop
takes around about 55 seconds. I've calculated that this shell script will take 6 days to complete.

Does anyone please know of a better (and significantly faster) way of doing this?

Any help would be greatly appreciated. I'm a bit of a unix newbie, and it took me hours just to get this far.
 

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LEARN ABOUT OPENSOLARIS

ps2pdf13

PS2PDF(1)							    Ghostscript 							 PS2PDF(1)

NAME

       ps2pdf - Convert PostScript to PDF using ghostscript
       ps2pdf12 - Convert PostScript to PDF 1.2 (Acrobat 3-and-later compatible) using ghostscript
       ps2pdf13 - Convert PostScript to PDF 1.3 (Acrobat 4-and-later compatible) using ghostscript

SYNOPSIS

       ps2pdf  [options...] {input.[e]ps|-} [output.pdf|-]
       ps2pdf12  [options...] {input.[e]ps|-} [output.pdf|-]
       ps2pdf13  [options...] {input.[e]ps|-} [output.pdf|-]

DESCRIPTION

       The ps2pdf scripts are work-alikes for nearly all the functionality (but not the user interface) of Adobe's Acrobat(TM) Distiller(TM) prod-
       uct: they convert PostScript files to Portable Document Format (PDF) files.

       If the output filename is not specified, the output is placed is a file of the same name with a '.pdf' extension. Either the input filename
       or the output filename can be '-' to request reading from stdin or writing to stdout, respectively, when used as a filter.

       The three scripts differ as follows:

       -      ps2pdf12 will always produce PDF 1.2 output (Acrobat 3-and-later compatible).

       -      ps2pdf13 will always produce PDF 1.3 output (Acrobat 4-and-later compatible).

       -      ps2pdf  per se currently produces PDF 1.4 output.  However, this may change in the future. If you care about the compatibility level
	      of the output, use ps2pdf12 or ps2pdf13, or use the -dCompatibility=1.x switch in the command line.

       There are some limitations in ps2pdf's conversion. See the HTML documentation for more information. A large number of  Adobe  Distiller(TM)
       parameters  which  can  be  used to control the conversion are also documented there, including instructions for generating PDF/X and PDF/A
       documents.

EXAMPLES

       Converting a figure.ps to figure.pdf:

	      ps2pdf figure.ps

       A conversion with more specifics:

	      ps2pdf -dPDFSETTINGS=/prepress figure.ps proof.pdf

       Converting as part of a pipe:

	      make_report.pl -t ps | ps2pdf -dCompatibility=1.3 - - | lpr

SEE ALSO

       gs(1), ps2pdfwr(1),
       Ps2pdf.htm in the Ghostscript documentation

BUGS

       See http://bugs.ghostscript.com/ and the Usenet news group comp.lang.postscript.

VERSION

       This document was last revised for Ghostscript version 8.63.

AUTHOR

       Artifex Software, Inc. are the primary maintainers of Ghostscript.  This manpage by George Ferguson.

8.63								   1 August 2008							 PS2PDF(1)
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