openstreetmap-client: 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/openstreetmap-client - from package: openstreetmap-client

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

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