idl2tcl: 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 Debian possible default full paths are:

/usr/bin/idl2tcl - from package: tcl-combat

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

Error in other languages:
idl2tcl: bevel nie gevind nie
idl2tcl: comandă negăsită
idl2tcl: comando não encontrado
idl2tcl: commande introuvable
idl2tcl: command not found
idl2tcl: käsku ei ole
idl2tcl: không tìm thấy lệnh
idl2tcl: komanda nerasta
idl2tcl: Kommando nicht gefunden.
idl2tcl: kommandot finns inte
idl2tcl: komut yok
idl2tcl: nie znaleziono polecenia
idl2tcl: níor aimsíodh an t-ordú
idl2tcl: no se encontró la orden
idl2tcl: no s'ha trobat l'ordre
idl2tcl: opdracht niet gevonden
idl2tcl: parancs nem található
idl2tcl: perintah tidak ditemukan
idl2tcl: príkaz nenájdený
idl2tcl: příkaz nenalezen
idl2tcl: команда не найдена
idl2tcl: командата не е открита
idl2tcl: 命令找不到
idl2tcl: コマンドが見つかりません