yahooquote: 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/yahooquote - from package: libfinance-yahooquote-perl

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

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