memccat: 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/memccat - from package: libmemcached-tools

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

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