clearcache: 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/share/torrus/bin/clearcache - from package: torrus-common

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