ncra: 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/ncra - from package: nco

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

On Debian possible default full paths are:

/usr/bin/ncra - from package: nco

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

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