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2010.08.28

UML, Everywhere

flowchart, n.: The innumerate misleading the illiterate.

— Stan Kelly-Bootle, “The Devil’s DP Dictionary”

A mechanical engineer who sees the symbol ⊥ in a diagram will immediately realize that a feature is specified to be perpendicular to another. In contrast, a software engineer looking at a diagram’s line ending with the symbol ◊ will, at best, wonder whether it denotes aggregation (as in UML), or a “zero or one” cardinality (as in IDEF1X), or something else invented by a creative academic. Worse, many developers will simply scratch their head in bewilderment.

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2010.08.24

Sane vim Editing of Unicode Files

Being able to use plain alphabeitc keys as editing commands is for many of us a great strength of the vi editor. It allows us to edit without hunting for the placement of the various movement keys on each particular keyboard, and, most of the time, without having to juggle in order to combine particular keys with ctrl or alt. However, this advantage can turn into a curse when editing files using a non-ASCII keyboard layout. When the keyboard input method is switched to another script (Greek in my case, or, say, Cyrillic for others) vi will stop responding to its normal commands, because it will encounter unknown characters. Here is how I've dealt with this problem.

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2010.08.04

Batch Files as Shell Scripts Revisited

Four years ago I wrote about a method that could be used to have the Unix Bourne shell interpret Windows batch files. I'm using this trick a lot, because programming using the Windows/DOS batch files facilities is decidedly painful, whereas the Bourne shell remains a classy programming environment. There are still many cases where the style of Unix shell programming outshines and outperforms even modern scripting languages.

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Unless otherwise expressly stated, all original material on this page created by Diomidis Spinellis is licensed under a Creative Commons Attribution-Share Alike 3.0 Greece License.