afuse-avahissh: 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/afuse-avahissh - from package: afuse

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

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