file2sdr: 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/file2sdr - from package: ion

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

Error in other languages:
file2sdr: bevel nie gevind nie
file2sdr: comandă negăsită
file2sdr: comando não encontrado
file2sdr: commande introuvable
file2sdr: command not found
file2sdr: käsku ei ole
file2sdr: không tìm thấy lệnh
file2sdr: komanda nerasta
file2sdr: Kommando nicht gefunden.
file2sdr: kommandot finns inte
file2sdr: komut yok
file2sdr: nie znaleziono polecenia
file2sdr: níor aimsíodh an t-ordú
file2sdr: no se encontró la orden
file2sdr: no s'ha trobat l'ordre
file2sdr: opdracht niet gevonden
file2sdr: parancs nem található
file2sdr: perintah tidak ditemukan
file2sdr: príkaz nenájdený
file2sdr: příkaz nenalezen
file2sdr: команда не найдена
file2sdr: командата не е открита
file2sdr: 命令找不到
file2sdr: コマンドが見つかりません