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man poster

Description: Create large posters out of PostScript pages
 Poster takes a one-page PostScript file and scales it to a specified
 size.  It can tile the resulting image into multiple smaller pages
 that can be pasted together to form the big poster.  Poster prefers
 EPS as its input although freer forms of PostScript are also
 understood.

Помимо poster еще есть epssplit (perl)

epssplit is a program that will split an encapsulated postscript (EPS)
file into smaller EPS files.  This is useful if you make a poster as an
EPS file but the printer cannot handle that paper size.  Use epssplit to
split the file into printer-managable chunks, print them out, and glue
the whole thing back together.  The files can be written as several EPS
files, or as one big (non-encaspulated) postscript file.  epssplit will
do its very best to minimize the number of pages.