gendarme: 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/gendarme - from package: gendarme

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

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