Compress a PDF in Ubuntu using GhostScript

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How_to_Compress_PDF_in_Linux.pdf

Refer: compress-pdf-linux

Synopsis / Example

$ sudo apt install ghostscript
$ gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -dNOPAUSE -dQUIET -dBATCH -sOutputFile=compressed_PDF_file.pdf input_PDF_file.pdf

dPDFSETTINGS   Description
/prepress    (default) Higher quality output (300 dpi) but bigger size
/ebook         Medium quality output (150 dpi) with moderate output file size
/screen        Lower quality output (72 dpi) but smallest possible output file size