Linux System Hierarchy

/ Specifies the root directory /boot Contains all the files and directories that are needed to boot the Linux kernel /dev Contains device files that are used for accessing physical devices. /etc Contains configuration files that are used by programs and services on your server /home Used for local home directories /media, /mnt Contain directories that are used for mounting devices in the file system tree /proc Used by the proc file system. This is a file system structure that gives access to kernel information /root Specifies the home directory of the root user /run Contains process and user-specific information that has been created since the last boot /srv May be used for data services like NFS, FTP and HTTP /sys Used as an interface to different hardware devices that are managed by the Linux /tmp Contains temporary files that may be deleted without any warning during boot /usr Contains subdirectories with program files, libraries for these program files and documentation about them /var Contains files that may change in size dynamically, such as log files, mail boxes, and spool files

You can do touch file{1..9} -> To create 9 files or rm{1..9}

uname -r -> Returns the current kernel version

ls -l /lib/modules/$(uname -r)

/etc/profile is the generic bash startup file