$ man ifconfig
No manual entry for ifconfig
See 'man 7 undocumented' for help when manual pages are not available.
$ dpkg -l | grep -i manpages
ii manpages 3.54-1ubuntu1 all Manual pages about using a GNU/Linux system
ii manpages-dev 3.54-1ubuntu1 all Manual pages about using GNU/Linux for development
ii manpages-posix 2.16-1 all Manual pages about using POSIX system
ii manpages-posix-dev 2.16-1 all Manual pages about using a POSIX system for development
如何在 Ubuntu 13.10 上安装 ifconfig 联机帮助页？