hamster-cli: 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/hamster-cli - from package: hamster-applet

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

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