ecaccess: 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/ecaccess - from package: ecaccess

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

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