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Unraid Console#


Basics of Console Usage#

  • If you are new to Linux, start by reading the Terminal
  • The commands below usually list a usage note, which is a link to a
    'man page'. In Linux, man pages describe the syntax of command
    usage, including all options for the command. Linux splits all of
    these command line commands into numbered groups, and often lists
    the group number with the command, eg. cat(1). Ignore the
    numbers! I think they are just there to confuse those of us who did
    not grow up speaking Linux.
  • In some commands, you have to press the Ctrl-C keystroke combination
    to break out. In less, use the q key to quit.
  • When a command produces output that is more than can fit on the
    physical console, you can use the Shift-PgUp and Shift-PgDn key
    combinations to page up and down through the console display,
    including what may appear to have scrolled off the top.
  • The commands below are often compared with DOS or Windows console
    commands, but even when they appear essentially equivalent, there
    can be very subtle differences, not necessarily mentioned below.
  • cat - usage and a how to
  • cat is like the DOS/Windows type, displays a file on
    screen. The file is assumed to be all text, and if not, will
    usually display garbage.
  • cat is used often below, but could easily be replaced by
    more or less (eg. cat /proc/cpuinfo could be less /proc/cpuinfo)
  • more - usage
  • more displays text files like cat, but pages them to the
    screen. It waits for a keystroke between each page.
  • less - usage
  • less pages text files like more, but also lets you page
    up and down through them (press q to quit).
  • ls - usage
  • ls is a little like the DOS/Windows dir command, for
    displaying directories in different ways, but the syntax is very
  • ls -l is a common way to list complete directory entries
  • see the Command Macros
    section for more complex examples
  • Note: in the default setup of Unraid, v is an alias for
    ls -l, so you can replace the ls -l above with just
    v. It is OK to use the alias, but it is far better to learn
    the actual ls -l command in case you are ever in a situation
    where the alias does not exist. (nearly every other Linux based
    device will NOT have v as an alias for ls -l, and it may
    even be aliased to something completely different!)
  • cp - usage
  • cp is like the DOS/Windows copy command.
  • rm - usage
  • rm is like the DOS/Windows del command.
  • cd - usage and a how to
  • cd is like the DOS/Windows cd command.
  • cd with no parameters changes to the users home directory
  • pwd - usage
  • pwd displays the users current directory
  • mkdir - usage
  • mkdir is like the DOS/Windows md command.
  • rmdir - usage
  • rmdir is like the DOS/Windows rd command.
  • chmod - usage
  • chmod is a little like the DOS/Windows attrib command,
    but the syntax is very different.
  • The Linux system of security and access attributes is very
    different to the Windows system. For more help, see
  • find - usage
  • find is used to search for files
  • Example: the command find . -iname "file*" will search
    the current folder and all sub-folders for files matching
    file*, using a case-insensitive search.

Console Commands for Hard Drives#

The following commands require the Device ID, which you can get from
the "Main" tab of your webgui. Locate your drive, then look for the Device ID in parentheses. It
is always 3 lowercase letters, beginning with either hd or sd,
eg. sda, sdk, hdc, hdg. For simplicity, sdx will be used
below, and you will substitute the appropriate Device ID for your drive.
(Extra spaces are added for clarity only, only one space is needed.)


To view the identity and configuration information for a drive (at the
console or terminal prompt)

hdparm -I /dev/sdx

To determine the read speed of a hard drive, the following command can
be used. The very last number in MB/sec is the one you want, ignore the
rest. Although one run will give you a decent result, for better
accuracy, take the average of at least 5 runs. See also Check Harddrive

hdparm -tT /dev/sdx


To obtain the SMART info for a drive, including some identity and
configuration information, and physical statistics and error history.
For more information about SMART and smartctl, see
here and
here and
and here and

smartctl -a -d ata /dev/sdx

Some newer drives and disk controllers will not issue a report if you
use the "-d ata" option, as they are not "ata" drives. (in fact,
they will respond with an error message instead) Most older disk
controllers did require the "-d ata" option, even if SATA drives. If
the smartctl report works without "-d ata" it is OK to leave it off.
If you get an error with "-d ata", try without it. The basic command
would then be

smartctl -a /dev/sdx

To copy the SMART report to a file called smart.txt on your Unraid
flash drive, that you can copy elsewhere and post to the forums, use the
following command. Of course, you can change the file name to what ever
you like, for example, smart_Seagate320_2008-12-15.txt.

smartctl -a -d ata /dev/sdx >/boot/smart.txt


smartctl -a -d ata /dev/sdx | todos >/boot/smart.txt

This second form makes it easier to look at the smart.txt file from
a Windows workstation, because it adds the standard end-of-lines that
are used in Windows.

To run a short or long SMART test on a drive, select one of the
following commands (short test takes minutes, long test can take several
hours depending on size of drive)

smartctl -d ata -tshort /dev/sdx
smartctl -d ata -tlong /dev/sdx

As of Unraid v4.3 final, smartctl is included with Unraid. Prior to
this, it needed to be copied to the flash drive, see
for links to obtaining it. If you had to copy it to your flash drive,
then the command to execute would be /boot/smartctl instead of just
smartctl. For example, the command to get a SMART report would be

/boot/smartctl -a -d ata /dev/sdx

other hard drive commands#

To view the partitioning of a drive, the drive geometry, and the total
number of sectors

fdisk -l -u /dev/sdx

To obtain the total number of sectors on a drive

blockdev --getsz /dev/sdx

To verify how the drive is labeled (note the "1" at the end of the
command, indicating the first partition on device /dev/sdx)

vol_id /dev/sdx1

Shows you the drives by their model and serial number and the drive
device ID (sda, hdc, etc) linked to each

ls -l /dev/disk/by-id
ls -l /dev/disk/by-id/[au]* | grep -v part1

Lists the drive devices that have "volume labels", and device ID
linked to each. Typically, only the flash drive will have an entry here
and it MUST have a volume label of "UNRAID" for Unraid to start up

ls -l /dev/disk/by-label

Note: in the default setup of Unraid, v is an alias for ls -l,
so you can replace the ls -l above with just v.

Console Commands for Networking#

Here are a few networking commands that will provide more info about the
driver, about the card, about its configured parameters and speed, and
about its connection statistics.

Note: The ethtool utility is included in some but not all Unraid
distributions. See
for more information about ethtool, and a download link.

  • lsmod - usage
  • lists the installed kernel modules, including your network
  • ethtool -i eth0 - usage
  • displays the network driver being used by your network chipset
    (for eth0), and its version
  • ethtool eth0
  • displays a number of the settings for your network chipset
  • displays the speed setting, typically "Speed: 1000 Mb/s" for a
    gigabit connection
  • displays the Wake-on-LAN setting, typically "Wake-on: g" if
    enabled for 'magic' packet
  • ifconfig - usage
  • displays various numeric parameters and statistics for your
  • displays your MAC address, as HWaddr
  • displays your local IP, as inet addr
  • displays your MTU setting
  • displays assorted transmit and receive statistics, including
    errors and collisions
  • ethtool -S eth0
  • displays more detailed network statistics
  • net lookup - usage
  • check for correct nameserver and DNS configuration, should
    provide the IP for Google if setup right
  • ping -c5 - usage
  • another way to check for correct nameserver configuration (if it
    times out, or produces errors, you need to set a nameserver)
  • egrep -i "eth0|rc.inet1|((forcedeth|r8169|e1000|e1000e|sky2|skge|tg3|bcm5700|sk98lin)[ :])|dhcp" /var/log/syslog -
  • displays lines in the system log (/var/log/syslog) affiliated
    with networking

Console Commands for System Management#

section needs more work

  • tail -f --lines=99 /var/log/syslog -

  • Display current end of syslog

  • If you leave the --lines parameter off, it will display the
    last 10 lines, which is often all you need. There are many
    situations though where at least a page full is useful, perhaps
    even 200 (eg. \--lines=200).
  • It is essentially real time, use Ctrl-C to quit.
  • free -l - usage

  • Show current memory usage

  • top - usage

  • List processes, with some memory and CPU stats

  • ps -eF - usage

  • List processes (similar to top but ...)

  • ps -eo size,pid,time,args --sort -size (those are commas not
    periods, double hyphen before sort)

  • List the processes on the server and their memory size (first
    column) sorted by memory size

  • testparm -sv - usage

  • Show system configuration parameters, including security and

  • w - usage

  • Show who is logged on and what they are doing

For excellent descriptions and examples of the use of screen
(usage), see
The screen tool allows you to 'detach' a terminal session, to keep
it running even if you log out of the terminal session. An interesting
example using screen is in the

To cleanly Stop the array from the command line#

The following section is from 2011, and does NOT take into consideration
any of the extra services etc that Unraid has had incorporated since

To shutdown the server properly from the command prompt, simply type in


To cleanly stop the array from the linux command line prior to a reboot
requires the use of several commands in turn. They will stop SAMBA,
unmount the disks, and then stop the Unraid server. These commands can
be performed on the linux command line as follows:

/root/samba stop

Then, for each of your data disks type (note, the command is umount, not
unmount. data disk1=/dev/md1, disk2=/dev/md2, etc...):

umount /dev/md1
umount /dev/md2
umount /dev/md3
umount /dev/md4
umount /dev/md5

/root/mdcmd stop

Note, a disk will not be able to be unmounted if it is busy. It will be
busy if it has an open file, or a process whose current directory is
located on the disk. If a disk is unable to be unmounted you'll first
need to terminate the processes holding it busy before it can be

To identify processes holding a disk busy you can type:

fuser -mv /mnt/disk* /mnt/user/*

To terminate processes holding a disk busy you can type (example is for

fuser -mvk /mnt/disk1

or you can individually terminate individual process IDs by typing

kill PID

(where PID = the numeric process ID as printed by the prior fuser -mv command)
--Joe L. 16:54, 3 January 2011 (UTC)

Console Commands for Files and Folders#

Many more file and folder commands can be found in the Basics of
Console Usage

  • df - usage
  • reports file system disk space usage
  • example: df /var/log reports space usage of the log folder,
    in RAM
  • mount - usage
  • mounts file systems; makes your files available!
  • umount - usage
  • unmounts mounted file systems
  • which - usage
  • checks for shell commands that are executable from the system

Console Commands for System Information#

In the commands below, cat is often used to display info, but
more and less can be used instead (see Basics of Console
section above).

CPU Info#

  • lscpu - usage
  • short summary of CPU info
  • cat /proc/cpuinfo
  • much longer report of all CPU's
  • grep --color lm /proc/cpuinfo
  • tests for 64 bit compatibility; if your CPU supports 64bit mode,
    then 'lm' will be highlighted in the cpuinfo report
  • grep --color vmx /proc/cpuinfo
  • tests for Intel VT CPU Virtualization Extensions; if your CPU
    supports them, then 'vmx' will be highlighted in the cpuinfo
  • grep --color svm /proc/cpuinfo
  • tests for AMD V CPU Virtualization Extensions; if your CPU
    supports them, then 'svm' will be highlighted in the cpuinfo
  • egrep --color 'lm\|vmx\|svm' /proc/cpuinfo
  • quick way to test all 3 above (thanks WeeboTech!)

Memory Info#

  • free - usage
  • abbreviated summary of general memory info
  • Note: be careful putting much importance on low free memory
    numbers, as Linux uses memory very differently than Windows
  • free -t
  • summary of general memory info with totals
  • free -mt
  • summary of general memory info with totals, all in megabytes
  • cat /proc/meminfo
  • more complete report of memory usage
  • slabtop - usage
  • displays kernel slab cache information in real time
  • slabtop -s c
  • slabtop display, but sorted by cache size usage
  • vmstat - usage
  • displays virtual memory statistics
  • vmstat -m
  • detailed memory usage

Sensor Info#

  • sensors - usage
  • displays some of available sensor info, may include system, CPU,
    and drive temperatures, system voltages, fan speeds and
    settings, etc
  • sensors-detect -
  • analyses system and displays all available sensors and needed
    modules, helps configure
    requires Perl installed first

Network Info#

Other Hardware Info#

Note: the following commands may or may not be installed in your release

  • lspci - usage
  • displays information about PCI buses and devices
  • lspci -vnn
  • displays more verbose information about PCI buses and devices
    (add another v (-vvnn) for even more verbose)
  • lspci -knn
  • displays more information about PCI buses and devices, including
    device numbers and assigned kernel modules
  • lsscsi - usage
  • displays information about SCSI devices
  • lsscsi -vgl (that's a lower case L)
  • displays more verbose information about SCSI devices, including
    ATA numbers!
  • lsusb - usage
  • displays information about USB buses and the devices connected
    to them
  • dmidecode - usage
  • displays the raw information from DMI/SMBIOS tables; may contain
    info on system manufacturer, motherboard, BIOS, memory,
    chipsets, etc
  • some of it is not human readable, and it is very often
    unreliable or wrong
  • if you see Invalid entry length (0). DMI table is broken!
    , then the DMI tables are bad. Sometimes a BIOS update
    will improve them, but not guaranteed.

Version Info#

  • uname -a - usage
  • displays the Linux kernel version
  • grep "emhttp: unRAID System Management Utility" /var/log/syslog - usage
  • displays the UnRAID version
  • ethtool -i eth0 - usage
  • displays the version of the network driver being used by your
    network chipset (for eth0)
  • openssl version - usage
  • displays the version of OpenSSL, if installed

Command Macros#

Typing commands at the console command prompt can get tiresome,
especially when repetitive. You can use the up and down keys to repeat
previous commands, or at least reduce the typing, but Linux provides for
command macros, otherwise called a command alias. Below is a sample
macro file (with the file name of macros) that you can use and
modify. It requires being executed from your go file, so insert a
line into /boot/config/go similar to /boot/macros.


# set dn like Windows dir/o-d, newest files first
echo "alias dn='ls -Aogt --group-directories-first --time-style=long-iso'">>/etc/profile

# set ds like dn plus Windows dir/s, newest files first, include all subdirs
echo "alias ds='ls -AogtR --group-directories-first --time-style=long-iso'">>/etc/profile

# start tail of syslog with plenty of lines
echo "alias tale='tail -f --lines=200 /var/log/syslog'">>/etc/profile

# an attempt to emulate the old Norton FF (FileFind)
echo "alias ff='find . -wholename '/proc' -prune -o -name '">>/etc/profile

# set screen blanking (if idle for 10 minutes) and monitor to standby (if idle for 30 minutes)
/bin/setterm -blank 10 -powersave powerdown -powerdown 30

When these macros are added to /etc/profile, they are available in
any console you open, whether by SSH or Telnet or at the physical
console on the UnRAID machine.

UnRAID already includes one macro - v is aliased to ls -l.