memslap: 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 CentOS possible default full paths are:

/usr/bin/memslap - from package: libmemcached10
/usr/bin/memslap - from package: libmemcached

You may install the required package with command yum install {package}

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