Difference between revisions of "Miscellaneous"

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== Ubuntu Starter Guide ==
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== Find open files on mount ==
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http://ubuntuguide.org
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  sudo lsof +f -- /var/media
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Also useful in case you're trying to work out why an unmounted partition is still showing as 'in use' in tools like e2fsck:
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== Adding startup service ==
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  sudo fuser -v -m /dev/sdX1
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To ensure a service which exists in /etc/init.d is run on startup, simply run:
 
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<pre>
 
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sudo update-rc.d <service> defaults
 
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</pre>
 
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== Enabling Printing ==
 
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# /bin/chmod 06555 /usr/bin/lpr /usr/bin/lprm
 
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# /sbin/chkconfig lpd on
 
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== Hardware ==
 
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=== ATI Radeon on a custom kernel ===
 
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Stock ubuntu kernels include the ATI kernel source, but if you've built the kernel yourself and you're getting '''atiddxDriScreenInit failed''' errors in Xorg.0.log, you'll need to install this manually with
 
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<pre>
 
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sudo apt-get install fglrx-kernel-source
 
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</pre>
 
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Reboot once the install completes, and fglrx should be good to go.
 
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=== Logitech MX-1000 ===
 
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==== Feisty ====
 
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Add this section to your /etc/X11/xorg.conf:
 
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<pre>
 
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Section "InputDevice"
 
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        Identifier      "Logitech MX-1000"
 
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        Driver          "mouse"
 
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        Protocol        "evdev"
 
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        Option          "CorePointer"
 
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        Option          "Name"            "PS2++ Logitech MX Mouse"
 
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        Option          "Device"          "/dev/input/event4"
 
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        Option          "Buttons"        "20"
 
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        Option          "ZAxisMapping"    "4 5"
 
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EndSection
 
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</pre>
 
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where "Name" and "Device" are read from the relevant "Name" and "Handler" for your device in /proc/bus/input/devices. Then follow the remaining instructions in http://www.ubuntuforums.org/showthread.php?t=65471
 
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Although this document describes the steps for a USB mouse, this also works when connected to the PS2 port. Note, however, that a Logitech MX-1000 forward and back keys are 8 and 9, and '''xvkbd''' is located in /usr/bin rather than /usr/X11R6/bin. In addition, as stated in the text, part 1.4 is unnecessary.
 
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==== Gutsy ====
 
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Add this section to your /etc/X11/xorg.conf:
 
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<pre>
 
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Section "InputDevice"
 
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        Identifier      "Logitech MX-1000"
 
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        Driver          "evdev"
 
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        Option          "CorePointer"
 
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        Option          "Name"            "PS2++ Logitech MX Mouse"
 
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        Option          "Device"          "/dev/input/event4"
 
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        Option          "Buttons"        "20"
 
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        Option          "ZAxisMapping"    "4 5"
 
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EndSection
 
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</pre>
 
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where "Name" and "Device" are read from the relevant "Name" and "Handler" for your device in /proc/bus/input/devices
 
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Also, I needed to append "SendCoreEvents" to the Logitech line in the layout section
 
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==== Hardy ====
 
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Add this section to your /etc/X11/xorg.conf:
 
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<pre>
 
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Section "InputDevice"
 
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    Identifier "Logitech MX1000"
 
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    Driver  "evdev"
 
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    Option  "Name"  "PS2++ Logitech MX Mouse"
 
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    Option  "HWHEELRelativeAxisButtons" "7 6"
 
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EndSection
 
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</pre>
 
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where "Name" is read from the "Name" for your device in /proc/bus/input/devices
 
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=== Gigabyte P55 ===
 
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To add temperature/fan sensor support, add '''it87''' to ''/etc/modules'' and reboot. Simply run '''sensors''' to get sensor output.
 
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== Convert m4a to mp3 ==
 
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* Ensure libfaad2-0 and ffmpeg (from medibuntu) are installed, and run:
 
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<pre>
 
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ffmpeg -ab <bitrate in kb/s> -i <inputfile> <outputfile>
 
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</pre>
 
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Note: the error '''output buffer too small''' can be ignored.
 
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== Changing default ALSA soundcard ==
 
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<pre>
 
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asoundconf list
 
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asoundconf set-default-card <cardname>
 
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</pre>
 
  
 
== List hardware details ==
 
== List hardware details ==
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* chmod 775 $dir
 
* chmod 775 $dir
  
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== Power management on VGA / DVI monitors ==
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== Measuring LAN performance ==
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Host 1 (linux):
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There is a standard called DPMS where a couple of pins are used for the computer to signal the monitor to go into a low-power mode.  This is separate from any power management settings on the computer itself, and from the kde/gnome screensaver.
 
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The nVidia driver fully supports DPMS, and the nvidia configuration tool typically sets it up for you.  If you want to turn it off, comment out the line in the monitor section of xorg.conf.
 
 
<pre>
 
<pre>
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# Option "DPMS" "true"
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iperf -s -p 8123
 
</pre>
 
</pre>
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Host 2 (mac):
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== awstats: Can't locate object method "isp_by_name" ==
 
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(Sometimes '''Can't locate auto/Geo/IP/isp_by_addr.al'''). This often manifests as a partially loaded awstats webpage, ending shortly after beginning of the "Hosts" table
 
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* Change ''/usr/share/awstats/plugins/geoip_isp_maxmind.pm'' from '''isp_by_xxx''' to '''org_by_xxx'''
 
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== awstats: Hostname not resolved ==
 
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To ensure that unresolved hosts (eg. intranet or corporate proxy hosts) are represented properly in awstats, add them to /var/lib/awstats/dnscache.txt
 
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== awstats: Couldn't open server log file "/var/log/apache2/access.log" : Permission denied ==
 
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Change /etc/cron.d/awstats to run command as root, rather than www-data
 
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== ssh: Slow login ==
 
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This may be due to the MOTD (Message Of The Day) scripts trying to get volume information for filesystem mounts that are no longer available (eg. Samba mounts). To fix this, update the MOTD scripts to make them ignore remote filesystems by editing ''/usr/share/pyshared/landscape/lib/disk.py'' and adding these lines after '''except ValueError: continue''':
 
 
<pre>
 
<pre>
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        # prevent slow reading of unavailable remote filesystems
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~/bin/iperf -c host1 -p 8123
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        if filesystem == "cifs":
 
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            continue
 
 
</pre>
 
</pre>
  
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== GRUB 2: error: no such disk ==
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== screen: Start a screen session with a title ==
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This may be caused by the line "insmod lvm", if you don't have the floppy drive disabled in the BIOS, but no floppy drive is present.
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  screen -S <title>
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== Disable user list at login ==
 
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<pre>
 
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sudo -u gdm gconftool-2 --set --type boolean /apps/gdm/simple-greeter/disable_user_list true
 
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</pre>
 

Latest revision as of 07:59, 3 November 2021

Find open files on mount

 sudo lsof +f -- /var/media

Also useful in case you're trying to work out why an unmounted partition is still showing as 'in use' in tools like e2fsck: 

 sudo fuser -v -m /dev/sdX1

List hardware details

sudo lshw -businfo

Add swap space

  • Create swap partition using fdisk
  • Create swap filesystem
sudo mkswap <device>
  • Activate swap
sudo swapon <device>
  • Modify /etc/fstab to allow swap to be activated at boot time

Change userid/groupid for an existing user/group

  • Change groupid in /etc/group
  • Run sudo grpconv to update /etc/gshadow
  • Change userid in /etc/passwd (and also the primary groupid for any changed groupids)
  • Run sudo pwconv to update /etc/shadow

Music Naming Strategy

Type Title TrackNum Artist Sort Artist Album Artist Sort Album Artist Album Sort Album Disc Genre Compilation
TIT2 TRCK TPE1 TSOP TPE2 TSO2 TALB TSOA TPOS TCON TCMP
Albums Title TrackNum Artist BLANK Directory1 BLANK / Number word Album Directory2 [Disc n] Disc Genre BLANK
Compilations Title TrackNum Artist BLANK Various Artists ZZZD Album Directory2 [Disc n] Disc Genre 1
Singles Title BLANK Artist BLANK Various Artists ZZZH Singles BLANK BLANK Genre 1
Soundtracks Title TrackNum Artist BLANK Various Artists ZZZL Album Directory2 [Disc n] Disc Soundtrack (24) 1
Spoken Title TrackNum Artist BLANK Directory1 ZZZP Album Directory2 [Disc n] Disc Genre BLANK
Fun Title BLANK Artist BLANK BLANK ZZZT Fun BLANK BLANK Comedy (57) 1
  • Albums: eyeD3 --to-v2.3 --set-text-frame="TSOP:" --set-text-frame="TPE2:$artist" --set-text-frame="TSO2:" --set-text-frame="TSOA:$album" --set-text-frame="TCMP:" $file
  • Compilations: eyeD3 --to-v2.3 --set-text-frame="TSOP:" --set-text-frame="TPE2:Various Artists" --set-text-frame="TSO2:ZZZD" --set-text-frame="TSOA:$album" --set-text-frame="TCMP:1" $file
  • Singles: eyeD3 --to-v2.3 --set-text-frame="TRCK:" --set-text-frame="TSOP:" --set-text-frame="TPE2:Various Artists" --set-text-frame="TSO2:ZZZH" --set-text-frame="TALB:Singles" --set-text-frame="TSOA:" --set-text-frame="TPOS:" --set-text-frame="TCMP:1" $file
  • Soundtracks: eyeD3 --to-v2.3 --set-text-frame="TSOP:" --set-text-frame="TPE2:Various Artists" --set-text-frame="TSO2:ZZZL" --set-text-frame="TSOA:$album" --set-text-frame="TCMP:1" $file

File Ownership

  • chown root:admin $file
  • chmod 664 $file
  • chown root:admin $dir
  • chmod 775 $dir

Measuring LAN performance

Host 1 (linux): 

iperf -s -p 8123

Host 2 (mac): 

~/bin/iperf -c host1 -p 8123

screen: Start a screen session with a title

 screen -S <title>
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