mysqluserclone: 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/mysqluserclone - from package: mysql-utilities

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

On Debian possible default full paths are:

/usr/bin/mysqluserclone - from package: mysql-utilities

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

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