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adding non-repository deb packages to apt

Posted 11-01-2011 at 05:48 AM by neonsignal

A local repository can be created for miscellaneous deb packages that are not part of a standard repository, so that they can be managed by apt-get.

Create a repository (it can be located anywhere):

Code:

mkdir /var/cache/apt/altdeb

Copy the relevant deb files to that place. Then generate a package index:

Code:

dpkg-scanpackages /var/cache/apt/altdeb /dev/null | gzip >/var/cache/apt/altdeb/Packages.gz

Add a line to...

neonsignal

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inserting unicode characters

Posted 11-01-2011 at 05:17 AM by neonsignal

The method for inserting unicode characters depends on the application.

For GTK based applications, a unicode character can be inserted by holding down ctrl-shift, typing 'u' followed by the hex code, and then releasing the ctrl-shift.

In vi, in insert mode, ctrl-v can be used, followed by 'u' and the hex code.

I do not know of a method for Qt based applications.

Of course, for entering significant amounts of non-ascii text, it can be useful...

neonsignal

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booting from the grub command line

Posted 10-30-2011 at 06:50 AM by neonsignal

There are grub2 boot failures (such as when disk UUIDs don't match) where it can be useful to do a minimal boot from the grub command line.

For typical systems (such as booting from the first partition of the first hard drive), this can be done with the following grub commands:

Code:

linux (hd0,1)/vmlinuz root=/dev/sda1
initrd (hd0,1)/initrd.img
boot

neonsignal

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changing the default system editor

Posted 10-30-2011 at 06:42 AM by neonsignal

The default system editor in Debian is typically nano. If you prefer a different editor such as vi, it can be changed by setting the link from /etc/alternatives/editor:

Code:

ln -sf /usr/bin/vi /etc/alternatives/editor

neonsignal

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compacting a VirtualBox Windows storage container

Posted 10-19-2011 at 09:47 PM by neonsignal

After a Windows client has been used inside VirtualBox for some time (particularly if large files have been removed), it can be useful to compact the storage container image (VDI) by removing unused space.

First, the space needs to be cleaned inside the client. This requires defragmenting the drive, and then running a program such as SysInternals sdelete to zero the unused space, so that the VirtualBox utilities are able to compact the file.

Code:

sdelete -c

...

neonsignal

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