BASH script which may be used to interact with memcache. All main memcache functions are supported. Fixed Revision working with new nc. New nc Versions do not terminate their connection after receiving EOL/EOF this need to be done by timeout or EOF Handling. Added both line #41. Remove '-q' parameter for new NC no support to lin #41.

membash.sh

#!/bin/bash

# Gist: 11375877
# Url: https://gist.github.com/goodevilgenius/11375877
#
# All memcache functions are supported.
# 
# Can also be sourced from other scripts, e.g.
#    source membash.sh
#    MCSERVER="localhost"
#    MCPORT=11211
#    foobar=$(mc_get foobar)
#    [ -z "$foobar" ] && foobar="default value"
#    mc_set foobar 0 "$foobar"

# original author: wumin, https://gist.github.com/ri0day/1538831
# updated by goodevilgenius to support debian-based systems, support more
# functions, and be more user-friendly 

mc_usage() {
	format_usage="membash: a memcache library for BASH \n\
https://gist.github.com/goodevilgenius/11375877\n\n\
Usage:\n
	\t $(basename "$0") [-hp] command [arguments] \n \
	\t [-h]\t memcached hostname or ip. \n \
	\t [-p]\t memcached port. \n\n\
Commands: \n \
	\t usage (print this help) \n \
	\t set/add/replace/append/prepend key exptime value \n \
	\t touch key exptime \n \
	\t incr/decr key value \n \
	\t get key \n \
	\t delete key [time] \n \
	\t stats \n \
	\t list_all_keys"
	echo -e $format_usage
}
mc_help() { mc_usage;}

# Fix; new NC does not end connection after EOF!
mc_sendmsg() { echo -e "$*\r" | nc $MCSERVER $MCPORT -w 1 | sed -e '{s/\x01.*//;T skip;q;:skip}';}

mc_stats() { mc_sendmsg "stats";}

mc_get_last_items_id() {
	LastID=$(mc_sendmsg "stats items"|tail -n 2|head -n 1|awk -F':' '{print $2}')
	echo $LastID
}

mc_list_all_keys() {
	:>/dev/shm/mc_all_keys_${MCSERVER}_${MCPORT}.txt
	max_item_num=$(mc_get_last_items_id)
	for i in `seq 1 $max_item_num`
	  do
		mc_sendmsg "stats cachedump $i 0" | awk '{print $2}'
	done >>/dev/shm/mc_all_keys_${MCSERVER}_${MCPORT}.txt 
	sed -i '/^$/d' /dev/shm/mc_all_keys_${MCSERVER}_${MCPORT}.txt
	cat /dev/shm/mc_all_keys_${MCSERVER}_${MCPORT}.txt
}

mc_get() { mc_sendmsg "get $1" | awk "/^VALUE $1/{a=1;next}/^END/{a=0}a" ;}

mc_touch() {
	key="$1"
	shift
	let exptime="$1"
	shift
	mc_sendmsg "touch $key $exptime"
}

mc_doset() {
	command="$1"
	shift
	key="$1"
	shift
	let exptime="$1"
	shift
	val="$*"
	let bytes=$(echo -n "$val"|wc -c)
	mc_sendmsg "$command $key 0 $exptime $bytes\r\n$val"
}

mc_set() { mc_doset set "$@";}
mc_add() { mc_doset add "$@";}
mc_replace() { mc_doset replace "$@";}
mc_append() { mc_doset append "$@";}
mc_prepend() { mc_doset prepend "$@";}

mc_delete() { mc_sendmsg delete "$*";}
mc_incr() { mc_sendmsg incr "$*";}
mc_decr() { mc_sendmsg decr "$*";}

mc_superpurge() {
	mc_list_all_keys > /dev/null
	if [ ! -z "/dev/shm/mc_all_keys_${MCSERVER}_${MCPORT}.txt" ];then
		grep "$1" /dev/shm/mc_all_keys_${MCSERVER}_${MCPORT}.txt >/dev/shm/temp.swap.${MCSERVER}_${MCPORT}.txt
	fi
	while read keys 
	do
		mc_sendmsg "delete ${keys}"
	done </dev/shm/temp.swap.${MCSERVER}_${MCPORT}.txt

	rm -rf /dev/shm/temp.swap.${MCSERVER}_${MCPORT}.txt
}

if [ "$(basename "$0" .sh)" = "membash" ]
then

	MCSERVER="localhost"
	MCPORT=11211

	while getopts "h:p:" flag
	do
		case $flag in
			h)
				MCSERVER=${OPTARG:="localhost"}
				;;
			p)
				MCPORT=${OPTARG:="11211"}
				;;
			\?)
				echo "Invalid option: $OPTARG" >&2
				;;
		esac
	done
	command="${@:$OPTIND:1}"
	[ -z "$command" ] && command="usage"
	let OPTIND++

	mc_$command "${@:$OPTIND}"

	exit $?

fi

netcat on CentOS 7.4 (1708)

# nc --version
Ncat: Version 6.40 ( http://nmap.org/ncat )