boxes: 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/bin/boxes - from package: boxes

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

On Debian possible default full paths are:

/usr/bin/boxes - from package: boxes

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

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