gitkeys: 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/gitkeys - from package: gnuit

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

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