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whatis looks up a given command and displays the header line from the manual section. You can then run the man(1) command to get more information. If the line starts `name(section) ...'
you can do `man -s section name' to get the documentation for it. Try `whatis ed' and then you should
do `man -s 1 ed' to get the manual page for ed(1).
whatis is actually just the -f option to the man(1)
command.
whatis uses the /usr/share/man/windex database. This database is created by catman(1M). If this database does not exist, whatis will fail.
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