2 - Raspberry PI Community Projects

tmpfs 514208 269136 245072 53% /dev/shm
/dev/sda5 44552904 36315896 7784380 83% /home
The id command displays the identity of the user running the session, along with the list of
groups they belong to. Since access to some files or devices may be limited to group members,
checking available group membership may be useful.
$ id
uid=1000(rhertzog) gid=1000(rhertzog) groups=1000(rhertzog),24(cdrom),25(
➥ floppy),27(sudo),29(audio),30(dip),44(video),46(plugdev),108(netdev)
➥ ,109(bluetooth),115(scanner)
B.2. Organization of the Filesystem Hierarchy
B.2.1. The Root Directory
A Debian system is organized along the File Hierarchy Standard (FHS). This standard defines the
purpose of each directory. For instance, the top-level directories are described as follows:
• /bin/: basic programs;
• /boot/: Linux kernel and other files required for its early boot process;
• /dev/: device files;
• /etc/: configuration files;
• /home/: user's personal files;
• /lib/: basic libraries;
• /media/*: mount points for removable devices (CD-ROM, USB keys and so on);
• /mnt/: temporary mount point;
• /opt/: extra applications provided by third parties;
• /root/: administrator's (root's) personal files;
• /sbin/: system programs;
• /srv/: data used by servers hosted on this system;
• /tmp/: temporary files; this directory is often emptied at boot;
440 The Debian Administrator's Handbook