Man pages (short for manuals) comes along with most Unix and Linux based Operating system. Each Man page can considered as a full document (manual) related to a topic of the OS.
- Convert page "man" in "pdf"
With temporary file
man -t bash > bash.ps && ps2pdf bash.ps && rm -f bash.ps
No temporary file, reading from STDIN
man -t bash | ps2pdf - > bash.pdf