myfilelength: 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/myfilelength - from package: atlc

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

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