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Merge Ps,Pdf Files and A4 into A5

I was trying to print man pages of OpenBSD. They were in .ps format and the paper size was a4. I wanted to convert the man pages so that two a5 pages lie onto an a4 page for the sake of being printer/environment friendly. I also want to combine them as a single document.
Here are the commands

1) Making OpenBSD man file a .ps file
mandoc -Tps /usr/share/man/man4/route.4 > route.ps

2)Converting 2 a4 pages into 2 a5 pages on a single a4 page
psnup -2 -Pa4 -pa4 input.ps output.ps
 This command converts 2 a4 pages into a5 ones and put them o a single a4 page. Magic isnt it?

3) Convert .ps files to
pdf ps2pdf input.ps output.pdf

4) Combine .pdf files
pdftk file1.pdf file2.pdf cat output outfile.pdf

There is also a psmerge command. But it gave me some errors. So I chose converting them into pdf and then combining way.

Ps: Here is a command for making 2 pages of a pdf file into one page:
The package is called pdjam in Ubuntu
pdfnup --nup 2x1 --outfile output.pdf  input.pdf

This makes a lot of economy

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