yaret: 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/yaret - from package: yaret

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

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