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Table 32-4: /var Directories Description printer queues as well as cron and at jobs. Holds temporary files that should be preserved between system reboots. Network Information Service (NIS) data files.
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The /proc file system is a special file system that is generated in system memory (see Table 32-5). It does not exist on any disk. /proc contains files that provide important information about the state of your system. For example, /proc/cpuinfo holds information about your computer's CPU processor. /proc/devices will list those devices currently configured to run with your kernel. /proc/filesystems will list the file systems. /proc files are really interfaces to the kernel, obtaining information from the kernel about your system. Table 32-5: /proc Directories and Files Description There is a directory for each process labeled by its number. /proc/1 is the directory for process 1. Contains information about the CPU, such as its type, make, model, and performance. List of the device drivers configured for the currently running kernel. Displays the DMA channels currently used. File systems configured into the kernel. Displays the interrupts in use. Shows the I/O ports in use. Holds an image of the physical memory of the system. Messages generated by the kernel. Symbol table for the kernel. The system "load average." Memory usage. Lists the kernel modules currently loaded. Status information about network protocols. System operating statistics, such as page fault occurrences. The time the system has been up. The kernel version.
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File /proc/num /proc/cpuinfo /proc/devices /proc/dma /proc/filesystems /proc/interrupts /proc/ioports /proc/kcore /proc/kmsg /proc/ksyms /proc/loadavg /proc/meminfo /proc/modules /proc/net /proc/stat /proc/uptime /proc/version
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To mount a file system, you have to specify its device name. The interfaces to devices that may be attached to your system are provided by special files known as device files. The names of these device files are the device names. Device files are located in the /dev
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directories and usually have abbreviated names ending with the number of the device. For example, fd0 may reference the first floppy drive attached to your system. On Linux systems operating on PCs, the IDE hard disk partitions have a prefix of hd, followed by an alphabetic character that labels the hard drive, and then a number for the partition. For example, hda2 references the second partition on the first IDE hard drive. The prefix sd references SCSI hard drives, so sda3 would reference the second partition on the first SCSI hard drive. In most cases, you can use the man command with a prefix to obtain more detailed information about this kind of device. For example, man sd displays the Man pages for SCSI devices. A complete listing of all device names can be found in the devices file located in the linux/doc/device-list directory at the www.kernel.org Web site. Table 32-6 lists several of the commonly used device names. Table 32-6: Device Name Prefixes Description IDE hard drives 1-4 are primary partitions, and 5 and up are logical partitions SCSI hard drives SCSI CD-ROM drives (used on Red Hat) SCSI CD-ROM drives (alternative prefix name, may be used on other distributions) Floppy disks SCSI tape drives SCSI tape drives, no rewind IDE tape drives Terminals Printer ports Pseudoterminals (used for remote logins) Analog joy sticks Midi ports Serial ports RAID devices Directory that holds RAID devices is rd. cn is the RAID controller and dn is the RAID disk for that controller Link to your CD-ROM device file Link to your CD-R or CD-RW device file Link to your modem device file Link to your floppy device file Link to your tape device file Link to your scanner device file
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Device Name hd sd scd sr fd st nst ht tty lp pty js midi ttyS md rd/cndn cdrom cdwriter modem floppy tape scanner
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The device name for your floppy drive is fd0 and is located in the directory /dev. /dev/fd0 references your floppy drive. Notice the numeral 0 after fd. If you have more than one floppy drive, they are represented by fd1, fd2, and so on. IDE hard drives use the prefix hd, while SCSI hard drives use the prefix sd. RAID devices, on the other hand, will use the prefix md. The prefix for a hard disk is followed by an alphabetic character that labels the hard drive and a number for the partition. For example, hda2 references the second partition on the first IDE hard drive, where the first hard drive is referenced with the character "a", as in hda. The device sdb3 refers to the third partition on the second SCSI hard drive (sdb). RAID devices, however, are numbered from 0, like floppy drives. Device md0 references the first RAID device and md1, the second. To find the device name, you can use df to display your hard partitions or examine the /etc/fstab file. The device name for your CD-ROM drive varies depending on the type of CD-ROM you have. The device name for an IDE CD-ROM has the same prefix as an IDE hard disk partition, hd, and is identified by a following character that distinguishes it from other IDE devices. For example, an IDE CD-ROM connected to your secondary IDE port may have the name hdc. An IDE CD-ROM connected as a slave to the secondary port may have the name hdd. The actual name is determined when the CD-ROM is installed, as happened when you installed your Linux system. SCSI CD-ROM drives use a different nomenclature for their device names. They begin with scd for SCSI drive and are followed by a distinguishing number. For example, the name of an SCSI CD-ROM could be scd0 or scd1. The name of your CD-ROM was determined when you installed your system. You can find out what it is either by examining the /etc/fstab file or using Linuxconf on your root user desktop.
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