osmfilter: 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/osmfilter - from package: osmctools

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

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