I wanted to join multiple pdf files together. I usually have used pdftk but it has been retired. You can get a pdftk source rpm but it depends on gcj and several other packages that have been superseded in Fedora 21.
So an alternative is needed…
# install poppler-utils yum install poppler-utils # use the pdfunite command to join the pdfs pdfunite pdf1.pdf pdf2.pdf output.pdf