mcs2h: 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/sbin/mcs2h - from package: ax25-tools

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

Error in other languages:
mcs2h: bevel nie gevind nie
mcs2h: comandă negăsită
mcs2h: comando não encontrado
mcs2h: commande introuvable
mcs2h: command not found
mcs2h: käsku ei ole
mcs2h: không tìm thấy lệnh
mcs2h: komanda nerasta
mcs2h: Kommando nicht gefunden.
mcs2h: kommandot finns inte
mcs2h: komut yok
mcs2h: nie znaleziono polecenia
mcs2h: níor aimsíodh an t-ordú
mcs2h: no se encontró la orden
mcs2h: no s'ha trobat l'ordre
mcs2h: opdracht niet gevonden
mcs2h: parancs nem található
mcs2h: perintah tidak ditemukan
mcs2h: príkaz nenájdený
mcs2h: příkaz nenalezen
mcs2h: команда не найдена
mcs2h: командата не е открита
mcs2h: 命令找不到
mcs2h: コマンドが見つかりません