application install /usr/local /opt

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  • /usr/local is a place to install files built by the administrator, usually by using the make command. The idea is to avoid clashes with files that are part of the operating systems that would either be overwritten or overwrite the local ones otherwise. eg. /usr/bin/foois part of the OS while /usr/local/bin/foois a local alternative,
  • /opt is a directory to install unbundled packages each in their own subdirectory. They are already built whole packages provided by an independent third party software distributor. For example someappwould be installed in /opt/someapp, one of its command would be in /opt/someapp/bin/foo [and then usually a symbolic link is made in one of the bindirectories in the PATH, or the program is called from a desktop file (see below)].

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