tiled: 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/tiled - from package: tiled

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

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