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ftsh - The Fault Tolerant Shell
The Fault-Tolerant Shell (ftsh) is a small language for system
integration that makes failures a first class concept.
Ftsh aims to combine the ease of scripting with very precise
error semantics. It is especially useful in building
distributed systems, where failures are common, making timeouts,
retry, and alternation necessary techniques. For example:
try for 30 minutes
cd /tmp
rm -f data
forany host in xxx yyy zzz
wget http://${host}/fresh.data data
end
end
If any element of the script fails, all running process trees
are reliably cleaned up, and the block is tried again with an
exponential backoff.
You might think of this as exception handling
for scripts. To learn more, please read the
technical manual,
or a more philosophical paper.
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