output: 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 CentOS possible default full paths are:

/usr/lib64/4ti2/bin/output - from package: 4ti2

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/output - from package: yagiuda

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

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