livestreamer: 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/livestreamer - from package: livestreamer

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

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