ucview: 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/ucview - from package: ucview

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

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