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I read The Linux Command Line by William Shotts, and there are some descriptions of Linux files (system directories):
The
/vardirectory contents don't change. This tree is where data that is likely to change is stored. Various databases, spool files, user mail, etc. are located here.
I am wondering: If the /var directory contents are not supposed to change, why is there a www directory in /var/www after installing apache-php?
The /var/www directory is where we must edit, create or delete files. This is a localhost public directory.
Why did he say, that the /var directory contents don't change?
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Use /var if you have a set number of files which may be growing (i.e. due to log appending or rotation) over time so as not to run out of disk space.
/var/lib/pgsql is where Postgres stores all its internal data, including the data you put into a database.
A new TMPFS-mounted file system, /var/run , is the repository for temporary system files that are not needed across system reboots in this Solaris release and future releases. The /tmp directory continues to be repository for non-system temporary files.
var stands for variable( it holds variable data, the directory it contains are changing in size every time) /opt stands for optional (generally third party Software are installed in this directory). /
That description of /var is self-contradictory. /var contains things that are prone to change, such as websites, temporary files (/var/tmp) and databases. The name is an abbreviation of "variable".
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