youtube-playlists: 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/youtube-playlists - from package: libwww-youtube-download-perl

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

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