arora-cacheinfo: 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/bin/arora-cacheinfo - from package: arora

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