restrict: 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/restrict - from package: emboss

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

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