hm-sync: 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-sync - from package: libnet-hiveminder-perl

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

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