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Full Discussion: how to find watermark in a pdf
Top Forums Shell Programming and Scripting how to find watermark in a pdf Post 302250395 by jim mcnamara on Thursday 23rd of October 2008 09:43:23 AM
Old 10-23-2008
pdf files can be in compressed format, so this may not help at all, and depending on the pdf engine the X Y and Z can be separate:

Code:
for file in *.pdf
do
   grep -l '(XYZ)Tj$' $file
done

You could also try:
Code:
for file in *.pdf
do
   if [[ `grep -q '(X)Tj$' $file` ]] ; then
       if [ `grep -q '(Y)Tj$' $file` ]] ; then
          if [[ `grep -q '(Z)Tj$' $file` ]] ; then
               echo "$file"
          fi
       fi
   fi
done

This last one is an EXTREMELY inefficient method.... but is usually the way watermarks are generated. One char at a time.
 

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LEARN ABOUT XFREE86

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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