hm-todo: 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/hm-todo - from package: libnet-hiveminder-perl

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

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