ncid: 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/ncid - from package: ncid-client

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

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