loki_freq: 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/loki_freq - from package: loki

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

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