/ var: It is a standard sub-directory of the root directory in Linux and other Unix-like operating systems that contains files to which the system writes data during the course of its operation. It contains variable data like system logging files, mail and printer spool directories. Some portions of /var are not shareable between different systems. For instance, /var/log, /var/lock, and /var/run. Other portions may be shared, notably /var/mail, /var/cache/man, /var/cache/fonts, and /var/spool/news. It contains a number of sub-directory. These sub-directories is designated by a forward slash (/). Among the other directories that are usually installed by default in the root directory are /bin , /boot , /dev , /etc , /home , /initrd , /lib , /lost+found , /misc , /mnt , /opt , /proc , /root , /sbin , /tmp ,/local, /log, /mail, and /usr.... etc Its contents are not included in /usr because situations can occur in which it is desired to mount /usr as read-o...
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