SUNWdoc
apropos displays the man page name, section number, and a short description for each man page whose NAME line contains keyword. This information is contained in the /usr/share/man/windex database created by catman(1M) . If catman(1M) was not run, or was run with the -n option, apropos fails. Each word is considered separately and the case of letters is ignored. Words which are part of other words are considered; for example, when looking for ‘compile’, apropos finds all instances of ‘compiler’ also.
apropos is actually just the -k option to the man(1) command.
Try
and
If the line starts ‘filename(section) ...’ you can do ‘man -s section filename’ to display the man page for filename. Try
and then
to get the manual page on the subroutine printf().