ncbo: 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/ncbo - from package: nco

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

On Debian possible default full paths are:

/usr/bin/ncbo - from package: nco

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

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