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). /
What does var do in Linux?
Purpose. /var contains variable data files. This includes spool directories and files, administrative and logging data, and transient and temporary files. Some portions of /var are not shareable between different systems.
What is the var file in Linux?
/var is a standard subdirectory 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.
What is var Ubuntu?
/var is dedicated to variable data, such as logs, databases, websites, and temporary spool (e-mail etc.) files that persist from one boot to the next. A notable directory it contains is /var/log where system log files are kept.
What should go in var?
/var This directory contains files which may change in size, such as spool and log files. /var/account Process accounting logs (optional). /var/adm This directory is superseded by /var/log and should be a symbolic link to /var/log. /var/backups Reserved for historical reasons. /var/cache Data cached for programs. /var/ …
What happens if VAR is full?
Barry Margolin. /var/adm/messages can’t grow. If /var/tmp is on the /var partition, programs that try to create temp files there will fail.
What is var tmp?
The /var/tmp directory is made available for programs that require temporary files or directories that are preserved between system reboots. Therefore, data stored in /var/tmp is more persistent than data in /tmp . Files and directories located in /var/tmp must not be deleted when the system is booted.
Does VAR need partition?
If your machine will be a mail server, you might need to make /var/mail a separate partition. Often, putting /tmp on its own partition, for instance 20–50MB, is a good idea. If you are setting up a server with lots of user accounts, it’s generally good to have a separate, large /home partition.
What is in var run?
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.
What is var spool for?
1. Purpose. /var/spool contains data which is awaiting some kind of later processing. Data in /var/spool represents work to be done in the future (by a program, user, or administrator); often data is deleted after it has been processed.
Where is VAR located in Ubuntu?
On Ubuntu, the Apache web server stores its documents in /var/www/html , which is typically located on the root filesystem with rest of the operating system.
How do I show all directories in Ubuntu?
The command “ls” displays the list of all directories, folder, and files present in the current directory.