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Shell programming

Shell programming

Posted Dec 8, 2012 6:53 UTC (Sat) by mathstuf (subscriber, #69389)
In reply to: Shell programming by Cyberax
Parent article: Quotes of the week

Some anecdara:

For Python, one I hit today was to change "except BaseException as e:" to "except BaseException: e = sys.exc_info()[0]" to support 2.4 through 3.2 in the same script. A little annoying, but not as pretty as either just-one-way canonical syntax.

As for shell, we found out that BSD sed and GNU sed don't support compatible -i flags. BSD requires a suffix, GNU requires there be no space if one is given, which BSD rejects. Using manual .bak files feels worse than either by a long shot. I think the call has been replaced by awk instead now.

In my experience, GNUisms tend to be harder to work around than Python incompatibilities. That's why I try to avoid them in my shell scripts. Unfortunately, sed -i is very convenient and sponge just isn't common enough, but this is slowly being trained out of my fingers when I'm in "portable" mode (I use every trick I can at the prompt, just not when writing .sh files).

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