intercept: 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/intercept - from package: tcpcopy

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

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