reglookup-timeline: 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/reglookup-timeline - from package: reglookup

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

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