python2-yaql: 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/python2-yaql - from package: python-yaql

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

Error in other languages:
python2-yaql: bevel nie gevind nie
python2-yaql: comandă negăsită
python2-yaql: comando não encontrado
python2-yaql: commande introuvable
python2-yaql: command not found
python2-yaql: käsku ei ole
python2-yaql: không tìm thấy lệnh
python2-yaql: komanda nerasta
python2-yaql: Kommando nicht gefunden.
python2-yaql: kommandot finns inte
python2-yaql: komut yok
python2-yaql: nie znaleziono polecenia
python2-yaql: níor aimsíodh an t-ordú
python2-yaql: no se encontró la orden
python2-yaql: no s'ha trobat l'ordre
python2-yaql: opdracht niet gevonden
python2-yaql: parancs nem található
python2-yaql: perintah tidak ditemukan
python2-yaql: príkaz nenájdený
python2-yaql: příkaz nenalezen
python2-yaql: команда не найдена
python2-yaql: командата не е открита
python2-yaql: 命令找不到
python2-yaql: コマンドが見つかりません