mysqluc: 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/mysqluc - from package: mysql-utilities

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

On Debian possible default full paths are:

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

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

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