[get] get all keys set in memcached

Base on @mu ? answer here. I've written a cache dump script.

The script dumps all the content of a memcached server. It's tested with Ubuntu 12.04 and a localhost memcached, so your milage may vary.

#!/usr/bin/env bash

echo 'stats items'  \
| nc localhost 11211  \
| grep -oe ':[0-9]*:'  \
| grep -oe '[0-9]*'  \
| sort  \
| uniq  \
| xargs -L1 -I{} bash -c 'echo "stats cachedump {} 1000" | nc localhost 11211'

What it does, it goes through all the cache slabs and print 1000 entries of each.

Please be aware of certain limits of this script i.e. it may not scale for a 5GB cache server for example. But it's useful for debugging purposes on a local machine.

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