Calculate Redis space usage by (colon separated) key space

Redis space usage

# PREFIX='' ; redis-cli -n 15 keys "${PREFIX}*" | sed s/^"${PREFIX}:"// | awk -F ":" '{print $1}' | sort | uniq | while read KEYSPACE; do echo -n "${PREFIX}${PREFIX:+:}${KEYSPACE}: "; redis-cli -n 15 keys "${PREFIX}${PREFIX:+:}${KEYSPACE}:*" | while read k; do redis-cli -n 15 MEMORY USAGE $k; done | awk '{s+=$1}END{print NR,s}'; done
buffer: 11 56752046
buffer_queue: 2 0
ice: 29126 1063022045
cast: 9705 12145987
meta_player: 1 1297
metrics: 23 2067
stations: 9 1462399
vast: 47 253390184

# PREFIX='vast' ; redis-cli -n 15 keys "${PREFIX}*" | sed s/^"${PREFIX}:"// | awk -F ":" '{print $1}' | sort | uniq | while read KEYSPACE; do echo -n "${PREFIX}${PREFIX:+:}${KEYSPACE}: "; redis-cli -n 15 keys "${PREFIX}${PREFIX:+:}${KEYSPACE}:*" | while read k; do redis-cli -n 15 MEMORY USAGE $k; done | awk '{s+=$1}END{print NR,s}'; done
vast:media: 19 9170282
vast:tracking_links: 9 27525
vast:tracking_props: 11 4758