etsf_io: 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/etsf_io - from package: etsf-io

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

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