memcslap: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/memcslap - from package: libmemcached-tools

You may install the required package with command apt-get install {package}

Error in other languages:
memcslap: bevel nie gevind nie
memcslap: comandă negăsită
memcslap: comando não encontrado
memcslap: commande introuvable
memcslap: command not found
memcslap: käsku ei ole
memcslap: không tìm thấy lệnh
memcslap: komanda nerasta
memcslap: Kommando nicht gefunden.
memcslap: kommandot finns inte
memcslap: komut yok
memcslap: nie znaleziono polecenia
memcslap: níor aimsíodh an t-ordú
memcslap: no se encontró la orden
memcslap: no s'ha trobat l'ordre
memcslap: opdracht niet gevonden
memcslap: parancs nem található
memcslap: perintah tidak ditemukan
memcslap: príkaz nenájdený
memcslap: příkaz nenalezen
memcslap: команда не найдена
memcslap: командата не е открита
memcslap: 命令找不到
memcslap: コマンドが見つかりません