multipath: 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:

/sbin/multipath - from package: device-mapper-multipath

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

On Debian possible default full paths are:

/sbin/multipath - from package: multipath-tools
/usr/lib/debug/sbin/multipath - from package: multipath-tools-dbg

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

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