boxshade: 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/boxshade - from package: boxshade

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

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