Let me narrate 3 nice experiences with pdf on Linux while at work
1) Merging multiple PDF files
gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOUTPUTFILE=filename.pdf file1.pdf file2.pdf……..fileN.pdf
2) Convert ps to pdf
ps2pdf file.ps file.pdf
3) Compressing PDF files.
4) Convert images to PDF
convert image1.jpg image2.gif image3.tiff…….imageN.xyz filename.pdf
Mehul Speaks 
Wow… thanks a lot for this.
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In this write-up we will be speaking about ten very best Android apps to use with your NFC tags.