LaTeX -- pdfcrop

TeX/LateX and related tips
1. Using pdfcrop to crop pdf so that some figures of pdf format can be
included with appropriate margins

Usage:
pdfcrop --margins 10 input.pdf output.pdf
pdfcrop --margins '5 10 5 20' --clip input.pdf output.pd

--TeX file--
\includegraphics{a.pdf}