pure Bash script to dump all keys in a memcached server

dumpMemcached

#!/bin/bash

# connect to memcached
exec 3<>/dev/tcp/"${1:-localhost}"/"${2:-11211}" || exit $?

# get slab numbers
printf 'stats slabs\r\n' >&3
slabnums=()
while IFS=' :' read -r stat slabnum _; do
    if [[ $stat == $'END\r' ]]; then
        break
    fi
    if ! [[ $slabnum =~ ^[0-9]*$ ]]; then
        continue
    fi
    for index in "${!slabnums[@]}"; do
        if [[ ${slabnums[index]} == "$slabnum" ]]; then
            continue 2
        fi
    done
    slabnums+=($slabnum)
done <&3

# dump each slab
for ((index=0;index<${#slabnums[@]};index++)); do
    slabnum=${slabnums[index]}
    printf 'stats cachedump %d 0\r\n' "$slabnum" >&3
    while read -r line; do
        if [[ $line == $'END\r' ]]; then
            break
        fi
        printf '%s\n' "${line%$'\r'}"
    done <&3
done

# close connection
printf 'quit\r\n' >&3
exec 3<&-