##telnetで接続

# telnet localhost 11211
Trying ::1...
Connected to localhost.
Escape character is '^]'.

##データの格納

set key1 0 0 6
value1
STORED

ワンライナー

(echo "set key1 0 0 6"; sleep 0.5s; echo "value1"; sleep 0.5s;) | telnet localhost 11211

##データの取得

get key1
VALUE key1 0 6
value1
END

ワンライナー

(echo "get key1"; sleep 0.5s;) | telnet localhost 11211

##データの書換

replace key1 0 0 6
value2
STORED

##格納されているデータの後ろに追記

append key1 0 0 6
value3
STORED
get key1
VALUE key1 0 12
value2value3

##格納されているデータの前に追記

prepend key1 0 0 6
value1
STORED
get key1
VALUE key1 0 18
value1value2value3
END

##データの削除

delete key1
DELETED

##データの加算/減算

set key1 0 0 3
100
STORED
incr key1 1000
1100
decr key1 2000
0
delete key1
DELETED

##切断

quit
Connection closed by foreign host.
#

キー一覧

#!/bin/bash -eu

IFS=$'\n'

hosts=(
  localhost
)

ports=(
  11211
  11212
  11213
)

for host in ${hosts[@]}; do
  for port in ${ports[@]}; do
    keys=()   
    echo "host:${host}:${port}"
    set +e
    items=$((echo 'stats items'; sleep 0.5s;) | telnet ${host} ${port} 2>/dev/null | egrep 'items:[0-9]+:number [0-9]+')
    set -e
    for item in ${items[@]}; do
      items=$(echo $item | perl -pe 's/^STAT items:([0-9]+):.+$/$1/')
      number=$(echo $item | perl -pe 's/^.+ ([0-9]+)$/$1/')
      keys+=($((echo "stats cachedump $items $number"; sleep 0.5s;) | telnet ${host} ${port} 2>/dev/null | egrep -v 'END|^Escape.+|^Trying.+|^Connected.+'))
    done

    for key in "${keys[@]+"${keys[@]}"}"; do
      echo $key | perl -pe 's/^ITEM (.+)?/$1/'
    done
  done
done