rasm2: 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/rasm2 - from package: radare2

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

Error in other languages:
rasm2: bevel nie gevind nie
rasm2: comandă negăsită
rasm2: comando não encontrado
rasm2: commande introuvable
rasm2: command not found
rasm2: käsku ei ole
rasm2: không tìm thấy lệnh
rasm2: komanda nerasta
rasm2: Kommando nicht gefunden.
rasm2: kommandot finns inte
rasm2: komut yok
rasm2: nie znaleziono polecenia
rasm2: níor aimsíodh an t-ordú
rasm2: no se encontró la orden
rasm2: no s'ha trobat l'ordre
rasm2: opdracht niet gevonden
rasm2: parancs nem található
rasm2: perintah tidak ditemukan
rasm2: príkaz nenájdený
rasm2: příkaz nenalezen
rasm2: команда не найдена
rasm2: командата не е открита
rasm2: 命令找不到
rasm2: コマンドが見つかりません