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virus scanning

Posted 11-20-2011 at 06:02 PM by neonsignal
Updated 11-20-2011 at 06:03 PM by neonsignal

Although malware has not been the same problem to the same degree on Linux as on other operating systems, it is still possible to run a virus scanner.

A straightforward one is clamav, which is in the repositories of many distros. Typically the install will set up a cron job to grab daily virus signature list updates (this can be disabled by removing /etc/cron.d/clamav-freshclam). The signature list can also be updated manually:

Code:

freshclam

To scan...

neonsignal

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mixing stable and testing packages

Posted 11-19-2011 at 09:42 PM by neonsignal

Sometimes when sticking with a Debian stable version, it can be useful to just update one or two packages to a testing or even unstable version, because of new features.

The ideal way to do this is to use backports, because these have been tested (and patched if necessary) to work with the stable versions of other packages. The backports repository is added to /etc/apt/sources.list:

Code:

deb http://backports.debian.org/debian-backports/ squeeze-backports main contrib

...

neonsignal

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allowing commands to continue after parent shell exit

Posted 11-05-2011 at 05:52 AM by neonsignal

Because commands that are started from a shell are child processes, they will normally be terminated when the shell exits.

A command can be run with nohup so that it can continue beyond the life of the parent shell, and output will be directed to the file nohup.out:

Code:

nohup command

Alternatively, if the command is already running (ie in the background), it can be allowed to continue by using disown before closing the shell:

Code:

disown

...

neonsignal

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resetting the root password

Posted 11-05-2011 at 05:36 AM by neonsignal
Updated 11-05-2011 at 05:38 AM by neonsignal

When the root password has been lost, it can be reset as follows.

At the grub menu, select 'e' to edit, and add the parameter 'init=/bin/bash' to the linux line. Then 'ctrl-x' to continue booting. This will start the system into a command shell.

Then remount the filesystem root as writable, so that the password can be changed:

Code:

mount -n -o rw,remount /

Change the password in the usual way, then sync to disk:

Code:

passwd

...

neonsignal

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mounting remote directory through ssh

Posted 11-03-2011 at 03:48 AM by neonsignal

The sshfs package can be used to fuse mount remote directories.

For example, a remote apt-get archive could be mounted as a rough way of sharing the package cache:

Code:

sshfs server:/var/cache/apt/archives /var/cache/apt/archives

And then unmounted later:

Code:

fusermount -u /var/cache/apt/archives

This method can be automated by setting up an entry in /etc/fstab (this works best if the ssh login is done through a PKI...

neonsignal

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