runcached (Run Cached)
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Execute commands while caching their output for subsequent calls. 
Command output will be cached for <cacheperiod> seconds and "replayed" for 
any subsequent calls. Original exit status will also be emulated.

After cacheperiod has expired, command will be re-executed and a new result 
will be cached. 
Caching depends on command and arguments executed and the 
path of the runcached executable. Cache results are stored in /tmp

You can use runcached to run resource-expensive commands multiple times, 
parsing different parts of its output each time. Those commands will be
run only once for each cacheperiod. 

Implementation is provided in 3 languages, python, C, BASH.


Usage:
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Python:
runcached.py [-c cacheperiod] <command to execute with args>

C:
runcached [-c cacheperiod] <command to execute with args>

Bash
runcached.sh  <command to execute with args>



Example:
========

1) Run the date command. Produce a new "date" every 5 seconds.
runcached.py -c 5 date

2) Zabbix userparameter which can be called multiple times , but actually executes only once every 20 seconds. 
Query multiple parameters of mysql at the same time, without re-running the query.

UserParameter=mysql.globalstatus[*],/usr/local/bin/runcached.py -c 20 /usr/bin/mysql -ANe \"show global status\"|egrep '$1\b'|awk '{print $ 2}'