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/opt以及/usr

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/opt

/opt is most often used for large third-party applications. It’s not uncommon to find /opt 

empty on some systems and jam-packed on others. For example, by default, Oracle will 

attempt to install itself in /opt. This directory doesn’t get all that much use on CentOS 

systems, and on most of our servers it is still empty. Do not worry if you never have the 

need to use this directory.

=========================================

/usr

This directory contains the vast majority of user software and is often the largest directory 

on a machine. Although it’s good to know where your software actually resides, because 

the default path includes /usr/bin (and /usr/sbin for root), most software “just works” 

wherever you are located on the system.

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