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From the author of Creating an Index for a Group of Files

Creating an Index for a Group of Files

You can also set up an index for a collection of PDF files, all of which must reside in the same folder (or in subfolders of a single folder). The search index exists as a separate file (suffixed “.pdx”) on your hard disk. When you want to search for text within the collection of files, you do an Advanced Search and tell Acrobat to search the pdx file; Acrobat will return hits for your target text in all the files in the set.

For example, I long ago set up a search index for my folder of Acumen Journal back issues. In addition to the PDF files, the folder contains the pdx file and an attendant folder (Figure 3); these together make up the data for the search index. When I search for a piece of text within my collection of Journals, I tell Acrobat to search the pdx file; Acrobat almost instantly returns a list of “hits,” indicating the positions of all the instances of that text throughout the collection of PDFs.

Figure 3 The search index for a folderful of PDF files resides in a pdx file and its associated folder.

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