stealthcleanup.gz: 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

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/share/doc/stealth/scripts/usr/bin/stealthcleanup.gz - from package: stealth

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