nocache: 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/nocache - from package: nocache

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