oasis: command not found

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/oasis - from package: oasis

You may install the required package with command apt-get install {package}

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