yarac: 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/yarac - from package: yara

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

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