idt: 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/idt - from package: ncl

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

On Debian possible default full paths are:

/usr/bin/idt - from package: ncl-ncarg

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

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