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File system
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The top of the hierarchical
file tree. The root directory contains the directories and files critical for system operation, such as the kernel (/kernel/unix), the device drivers, and the programs used to boot the system. It also contains the mount point directories where local and remote file systems can be attached to the file tree.
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/etc
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Directory
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Contains system files used in system administration.
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/usr
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File system
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Contains architecture-dependent and -independent sharable files. Files such as man pages that can be used on all types of systems are in /usr/share.
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/home
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File system
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The mount point for the users' home directories, which store users' work files.
By default, /home is now an automounted file system.
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/var
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Directory
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Contains system files and directories that are likely to change or grow over the life of the local system. These include system logs, vi and ex backup files, and uucp files.
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/opt
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File system
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Mount point for optional third-party software. On some systems /opt may be a UFS file system on a local disk partition.
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/tmp
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File system
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Temporary files, cleared each time the system is booted or /tmp is unmounted
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/vol
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File system
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Contains directories for removable media, managed by vold(1M)
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/proc
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File system
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Contains a list of active system processes, by number. Does not use any disk space.
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/sbin
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Directory
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Essential executables used in the booting process and in manual system recovery
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