Published on 24 Mar 2004
SSH is most commonly known for its ability to login to remote hosts. But it also allows the execution of commands on the remote host without a prior login although it still requires successful authentication (otherwise, there would be no sense in using SSH, right?!):
Published on 23 Mar 2004
A series of measurements $x_i = x_1, \dots, x_n$
is a one dimensional list or array which is by nature very space inefficient to store. A histogram is a two dimensional data structure that can be configured to a custom trade off between space and accuracy. The values are sorted into bucket according to their size.
Published on 23 Mar 2004
When comparing two or more series of measurements, it is useful have a relative measure like the distribution of values.
Published on 23 Mar 2004
A mean value is only valid for the exact series of measurements that it was calculated from. When adding one or more measurements to the series, the mean value needs to be calculated again and probably result in a similar but not the same mean value. The reason for this is the fact that the final mean value can only be calculated from an infinite number of measurements but this is apparently impossible to do.
Published on 23 Mar 2004
The following table provides a list of well-known german term and their english translation:
Published on 10 Mar 2004
Imagine you intend to give threaded programming in perl a try. You do not want to update the system-wide perl installation because many perl modules are not thread-safe. A private perl installation is the only viable solution. After unpacking the perl distribution and changing into the newly created directory executethe following commands:
Published on 10 Mar 2004
Subversion supports some keywords which it is able to substitute in a versioned file though there are two things you need to do:
Published on 10 Mar 2004
The property svn:ignore
may contain new-line separated patterns which describe filenames to ignore for repository actions. Specifying a single pattern is rather straight forward.
Published on 10 Mar 2004
Binary packages provide an excellent method to distribute packages among several hosts or have a downgrade path in case a package update fails.
Published on 10 Mar 2004
Utilities like rsync
and cvs
accept an environment variable to contain a command which allows logging in to a remote system before executing the desired action. The result seemingly causes the action to be executed locally although it is actually tunnelled through the specified program. Formerly rsh
was used which contains some serious design flaws therefore ssh
was designed to replace it. Refer to notes RSync over SSH and CVS over SSH for details how to use ssh
with these utilities.