pussy: command not found

Have You tried accessing the binary with the full path?

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/pussy - from package: sendfile

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