Difference between revisions of "Miscellaneous"

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== Find open files on mount ==
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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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  sudo fuser -v -m /dev/sdX1
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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 ==
Line 71: Line 60:
 
* 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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<pre>
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iperf -s -p 8123
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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.
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</pre>
 +
Host 2 (mac):
 
<pre>
 
<pre>
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# Option "DPMS" "true"
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~/bin/iperf -c host1 -p 8123
 
</pre>
 
</pre>
  
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== awstats: Can't locate auto/Geo/IP/isp_by_addr.al ==
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== screen: Start a screen session with a title ==
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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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  screen -S <title>

Latest revision as of 08:59, 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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