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1.3. WORKINGWITHENCRYPTEDDOCUMENTS
3
cpdf in.pdf f ˜3-˜1 -o out.pdf
Extractthelastthreepagesofadocument,inorder.
1.3 WorkingwithEncryptedDocuments
Inordertoperformmanyoperations,encryptedinputPDFfilesmustbedecrypted. Some
requiretheownerpassword,someeithertheuserorownerpasswords. Eitherpasswordis
suppliedbywritinguser=<password>orowner=<password>followingeachinputfile
requiringit(beforeorafteranyrange).Thedocumentwillnotbere-encrypteduponwriting.
Forexample:
cpdf in.pdf f user=charles -info
cpdf in.pdf f owner=fred reverse -o o out.pdf
Tore-encryptthefilewithitsexistingencryptionuponwriting,whichisrequiredifonlythe
userpasswordwassupplied,butallowedinanycase,addthe-recryptoption:
cpdf in.pdf f user=fred d reverse e -recrypt t -o o out.pdf
Thepasswordrequired(owneroruser)dependsupontheoperationbeingperformed.Separate
facilitiesareprovidedtodecryptandencryptfiles(SeeSection4).
1.4 StandardInputandStandardOutput
Thusfar,wehaveassumedthattheinputPDFwillbereadfromafileondisk,andtheoutput
writtensimilarly. Oftenit’susefultobeabletoreadinputfromstdin(StandardInput)or
writeoutputtostdout(StandardOutput)instead.Thetypicaluseistojoinseveralprograms
togetherintoapipe,passingdatafromonetothenextwithouttheuseofintermediatefiles.Use
-stdintoreadfromstandardinput,and-stdouttowritetostandardinput,eithertopipe
databetweenmultipleprograms,ormultipleinvocationsofthesameprogram.Forexample,
thissequenceofcommands(alltypedononeline)
cpdf in.pdf reverse -stdout |
cpdf -stdin 1-5 -stdout t |
cpdf -stdin reverse -o out.pdf
extractsthelastfivepagesofin.pdfinthecorrectorder,writingthemtoout.pdf.Itdoes
thisbyreversingtheinput,takingthefirstfivepagesandthenreversingtheresult.
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4
CHAPTER1. BASICUSAGE
Tosupplypasswordsforafilefrom-stdin,use-stdin-owner <password>and/or
-stdin-user <password>.
Using-stdoutonthefinalcommandinthepipelinetooutputthePDFtoscreenisnot
recommended,sincePDFfilesoftencontaincompressedsectionswhicharenotscreen-readable.
Severalcpdfoperationswritetostandardoutputbydefault(forexample,listingfonts).A
usefulfeatureofthecommandline(notspecifictocpdf)istheabilitytoredirectthisoutputto
afile.Thisisachievedwiththe>operator:
cpdf -info in.pdf > > file.txt
Usethe-infooperation(SeeSection11.2),redirectingtheoutputtofile.txt.
1.5 DoingseveralthingsatoncewithAND
ThekeywordANDcanbeusedtostringtogetherseveralcommandsinone.Theadvantage
comparedwithusingpipesisthatthefileneednotberepeatedlyparsedandwrittenout,saving
time.
TouseAND,simplyleaveofftheoutputspecifier(e.g-o)ofonecommand,andtheinput
specifier(e.gfilename)ofthenext.Forinstance:
cpdf -merge in.pdf in2.pdf f AND D -add-text "Label"
AND -merge in3.pdf -o out.pdf
Mergein.pdfandin2.pdftogether,addtexttobothpages,appendin3.pdfandwriteto
out.pdf.
Tospecifytherangeforeachsection,use-range:
cpdf -merge in.pdf in2.pdf f AND D -range e 2-4 4 -add-text "Label"
AND -merge in3.pdf -o out.pdf
1.6 Units
Whenmeasurementsaregiventocpdf,theyareinpoints(1point=1/72inch). Theymay
optionallybefollowedbysomeletterstochangethemeasurement.Thefollowingaresupported:
pt Points(72pointsperinch).Thedefault.
cm
Centimeters
mm
Millimeters
in Inches
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1.7. PDFVERSIONNUMBERS
5
1.7 PDFVersionNumbers
WhenanoperationwhichusesapartofthePDFstandardwhichwasintroducedinalater
versionthanthatoftheinputfile,thePDFversionintheoutputfileissettothelaterversion
(mostPDFviewerswilltrytoloadanyPDFfile,evenifitismarkedwithalaterversionnumber).
However,thisautomaticversionchangingmaybesuppressedwiththe-keep-versionflag.
HereisalistofAcrobatversionstogetherwiththemaximumPDFversiontheyareintended
tosupport:
PDF1.2 Acrobat3.0
PDF1.3 Acrobat4.0
PDF1.4 Acrobat5.0
PDF1.5 Acrobat6.0
PDF1.6 Acrobat7.0
PDF1.7 Acrobat8.0,9.0,10.0
IfyouwishtomanuallyalterthePDFversionofafile,usethe-set-versionoptiondescribed
inSection15.5.
1.8 FileIDs
PDFfilescontainanID(consistingoftwoparts),usedbysomeworkflowsystemstouniquely
identifyafile.TochangetheID,behavior,usethe-change-idoperation.Thiswillcreatea
newIDfortheoutputfile.
cpdf -change-id in.pdf -o o out.pdf
Writein.pdftoout.pdf,changingtheID.
1.9 Linearization
LinearizedPDFisaversionofthePDFformatinwhichthedataisheldinaspecialmannerto
allowcontenttobefetchedonlywhenneeded.ThismeansviewingamultipagePDFovera
slowconnectionismoreresponsive.Bydefault,cpdfdoesnotlinearizeoutputfiles.Tomakeit
doso,addthe-loptiontothecommandline,inadditiontoanyothercommandbeingused.
Forexample:
cpdf -l l in.pdf -o out.pdf
Linearizethefilein.pdf,writingtoout.pdf.
Thisrequirestheexistenceoftheexternalprogramcpdflinwhichisprovidedwithcommercial
versionsofcpdf.Thismustbeinstalledasdescribedintheinstallationdocumentationprovided
withyourcopyofcpdf.Ifyouareunabletoinstallcpdflin,youmustuse-cpdflintolet
cpdfknowwheretofindit:
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CHAPTER1. BASICUSAGE
cpdf.exe -cpdflin n "C:\\cpdflin.exe" -l in.pdf -o o out.pdf
Linearizethefilein.pdf,writingtoout.pdf.
Inextremis,youmayplacecpdflinanditsresourcesinthecurrentworkingdirectory,
thoughthisisnotrecommended.Forfurtherhelp,refertotheinstallationinstructionsforyour
copyofcpdf.
1.10 ObjectStreams
PDF1.5introducedanewmechanismforstoringobjectstosavespace: objectstreams. by
default,cpdfwillpreserveobjectstreamsininputfiles,creatingnomore. Topreventthe
retentionofexistingobjectstreams,use-no-preserve-objstm:
cpdf -no-preserve-objstm in.pdf f -o o out.pdf
Writethefilein.pdftoout.pdf,removinganyobjectstreams.
Tocreatenewobjectstreamsifnoneexist,oraugmenttheexistingones,use-create-objstm:
cpdf -create-objstm m in.pdf -o o out.pdf
Writethefilein.pdftoout.pdf,preservinganyexistingobjectstreams,andcreatinganynewones
fornewobjectswhichhavebeenadded.
Tocreatewhollynewobjectstreams,usebothoptionstogether:
cpdf -create-objstm m -no-preserve-objstm m in.pdf -o o out.pdf
Writethefilein.pdftoout.pdfwithwhollynewobjectstreams.
FileswrittenwithobjectstreamswillbesettoPDF1.5orhigher,unless-keep-versionis
used(seeabove).
1.11 MalformedFiles
TherearemanymalformedPDFfilesinexistence,includingmanyproducedbyotherwise-
reputableapplications.cpdfattemptstocorrecttheseproblemssilently.
Grosslymalformedfileswillbereconstructed. Thereconstructionprogressisshownon
stderr(StandardError):
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1.12. ERRORHANDLING
7
./cpdf in.pdf -o o out.pdf
couldn’t lex object number
Attempting to reconstruct the e malformed d pdf in.pdf...
Read 5530 objects
Malformed PDF F reconstruction succeeded!
Sometimesfilescanbetechnicallywell-formedbutuseinefficientPDFconstructs.Ifyouaresure
theinputfilesyouareusingareimpeccablyformed,the-fastoptionaddedtothecommand
line(or,ifusingAND,toeachsectionofthecommandline).Thiswillusecertainshortcutswhich
speedupprocessing,butwouldfailonbadly-producedfiles.
The-fastoptionmaybeusedwith:
Chapter3
-rotate-contents -upright t -vflip p -hflip
-shift -scale e -scale-to-fit t -scale-contents
Chapter8
-add-text
-stamp-on -stamp-under -combine-pages
Ifproblemsoccur,refrainfromusing-fast.
1.12 ErrorHandling
Whencpdfencountersanerror,itexitswithcode2.Anerrormessageisdisplayedonstderr
(StandardError). Innormalusage,thismeansit’sdisplayedonthescreen. Whenabador
inappropriatepasswordisgiven,theexitcodeis1.
1.13 ControlFiles
cpdf -control l <filename>
cpdf -args <filename>
Someoperatingsystemshavealimitonthelengthofacommandline.Tocircumventthis,or
simplyforreasonsofflexibility,acontrolfilemaybespecifiedfromwhichargumentsaredrawn.
Thisfiledoesnotsupportthefullsyntaxofthecommandline.Commandsareseparatedby
whitespace,quotationmarksmaybeusedifanargumentcontainsaspace,andthesequence\"
maybeusedtointroduceagenuinequotationmarkinsuchanargument.
Several-controlargumentsmaybespecified,andmaybemixedinwithconventional
command-linearguments.Thecommandsineachcontrolfileareconsideredintheorderin
whichtheyaregiven,afterallconventionalargumentshavebeenprocessed.Itisrecommended
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8
CHAPTER1. BASICUSAGE
touse-argsinallnewapplications. However, -controlwillbesupportedforlegacy
applications.
Toavoidinterferencebetween-controlandAND,anewmechanismhasbeenadded.
Using-argsinplaceof-controlwillperformdirecttextualsubstitutionofthefileintothe
commandline,priortoanyotherprocessing.
1.14 StringArguments
Commandlinesarehandleddifferentlyoneachoperatingsystem.Somecharactersarereserved
withspecialmeanings,evenwhentheyoccurinsidequotedstringarguments.Toavoidthis
problem,cpdfperformsprocessingonstringargumentsastheyareread.
Abackslashisusedtoindicatethatacharacterwhichwouldotherwisebetreatedspecially
bythecommandlineinterpreteristobetreatedliterally. Forexample,Unix-likesystems
attributeaspecialmeaningtotheexclamationmark,sothecommandline
cpdf -add-text t "Hello!" " in.pdf -o out.pdf
wouldfail.Wemustescapetheexclamationmarkwithabackslash:
cpdf -add-text t "Hello\!" " in.pdf f -o o out.pdf
Itfollowsthatbackslashesintendedtobetakenliterallymustthemselvesbeescaped(i.e.written
\\).
1.15 TextEncodings
Somecpdfcommandswritetexttostandardoutput,orreadtextfromthecommandlineor
configurationfiles.Theseare:
-info
-list-bookmarks
-set-authoretal.
-list-annotations
Therearethreeoptionstocontrolhowthetextisinterpreted:
-utf8
-stripped
-raw
Add-utf8touseUnicodeUTF8,-strippedtoconvertto7bitASCIIbydroppinganyhigh
characters,or-rawtoperformnoprocessing.Thedefaultis-stripped.
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Chapter2
MergingandSplitting
cpdf -merge e in1.pdf [<range>] in2.pdf [<range>] [<more names/ranges>]
[-retain-numbering] [-remove-duplicate-fonts] ] -o o out.pdf
cpdf -split t in.pdf -o o <format> > [-chunk k <chunksize>]
cpdf -split-bookmarks <level> > in.pdf -o o <format>
2.1 Merging
The-mergeoperationallowthemergingofseveralfilesintoone. Rangescanbeusedto
selectonlyasubsetofpagesfromeachinputfileintheoutput.Theoutputfileconsistsofthe
concatenationofalltheinputpagesintheorderspecifiedonthecommandline.Actually,the
-mergecanbeomitted,sincethisisthedefaultoperationofcpdf.
cpdf -merge e a.pdf 1 b.pdf 2-end -o out.pdf
Takepageoneofa.pdfandallbutthefirstpageofb.pdf,mergethemandproduceout.pdf.
Mergemaintainsbookmarks,nameddestinations,andnamedictionaries.
Formsandotherobjectswhichcannotbemergedareretainediftheyarefromthedocument
whichfirstexhibitsthatfeature.
The-retain-numberingoptionkeepsthePDFpagenumberinglabelsofeachdocument
intact,ratherthanrenumberingtheoutputpagesfrom1.
The-remove-duplicate-fontsensuresthatfontsusedinmorethanoneoftheinputs
onlyappearonceintheoutput.
9
10
CHAPTER2. MERGINGANDSPLITTING
2.2 Splitting
The-splitoperationsplitsaPDFfileintoanumberofpartswhicharewrittentofile,their
namesbeinggeneratedfromaformat.Theoptional-chunkoptionallowsthenumberofpages
writtentoeachoutputfiletobeset.
cpdf -split a.pdf -o o out%%%.pdf
Splita.pdftothefilesout001.pdf,out002.pdfetc.
cpdf -split a.pdf 1 1 even n -chunk k 10 0 -o o dir/out%%%.pdf
Splittheevenpagesofa.pdftothefilesout001.pdf,out002.pdfetc.withatmosttenpagesin
eachfile.Thedirectory(folder)dirmustexist.
Iftheoutputformatdoesnotprovideenoughnumbersforthefilesgenerated,theresultis
unspecified.Thefollowingformatoperatorsmaybeused:
%, %%, %%% etc.
Sequencenumberpaddedtothenumberofpercentsigns
@F
Originalfilenamewithoutextension
@N
Sequencenumberwithoutpaddingzeroes
@S
Startpageofthischunk
@E
Endpageofthischunk
@B
Bookmarknameatthispage
2.3 SplittingonBookmarks
The-split-bookmarks <level>operationsplitsaPDFfileintoanumberofparts,accord-
ingtothepagerangesimpliedbythedocument’sbookmarks.Thesepartsarethenwrittento
filewithnamesgeneratedfromthegivenformat.
Level0denotesthetop-levelbookmarks,level1thenextlevel(sub-bookmarks)andsoon.
So-split-bookmarks 1createsbreaksonlevel0andlevel1boundaries.
cpdf -split-bookmarks 0 a.pdf -o o out%%%.pdf
Splita.pdftothefilesout001.pdf,out002.pdfonbookmarkboundaries.
Now,theremaybemanybookmarksonasinglepage(forinstance,ifparagraphsarebook-
markedortherearetwosubsectionsononepage).Thesplitscalculatedby-split-bookmarks
ensurethateachpageappearsinonlyoneoftheoutputfiles.Itispossibletousethe@operators
above,includingoperator@Bwhichexpandstothetextofthebookmark:
cpdf -split-bookmarks 0 a.pdf -o o @B.pdf
Splita.pdfonbookmarkboundaries,usingthebookmarktextasthefilename.
2.4. ENCRYPTINGWITHSPLITANDSPLITBOOKMARKS
11
Thebookmarktextusedforanameisconvertedfromunicodeto7bitASCII,andthefollowing
charactersareremoved,inadditiontoanycharacterwithASCIIcodelessthan32:
/ ? < < > > \ :
*
| " ˆ + =
2.4 EncryptingwithSplitandSplitBookmarks
TheencryptionparametersdescribedinChapter4maybeaddedtothecommandlinetoencrypt
eachsplitPDF.Similarly,the-recryptswitchdescribedin1maybygiventore-encrypteach
filewiththeexistingencryptionofthesourcePDF.
12
CHAPTER2. MERGINGANDSPLITTING
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