in container,I can‘t use man in ubuntu image ,by search i find this link to slove the problem

cp /etc/dpkg/dpkg.cfg.d/excludes /etc/dpkg/dpkg.cfg.d/excludes.bak
apt update && apt-get install -y man manpages-posix

how to use man in centos image? I find this link

remove "tsflags=nodocs" from "/etc/yum.conf"

yum install -y man man-pages

this link explanation it:

Package documentation

By default, the CentOS containers are built using yum‘s nodocs option, which helps reduce the size of the image. If you install a package and discover files missing, please comment out the line tsflags=nodocs in /etc/yum.conf and reinstall your package.

In container,I can't use man

原文：https://www.cnblogs.com/anyux/p/11791016.html