rmmer_1.noask: command not found

Have You tried accessing the binary with the full path?

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/share/doc/mh-book/examples/mh/bin/rmmer_1.noask - from package: mh-book

You may install the required package with command apt-get install {package}
Error in other languages:
rmmer_1.noask: bevel nie gevind nie
rmmer_1.noask: comandă negăsită
rmmer_1.noask: comando não encontrado
rmmer_1.noask: commande introuvable
rmmer_1.noask: command not found
rmmer_1.noask: käsku ei ole
rmmer_1.noask: không tìm thấy lệnh
rmmer_1.noask: komanda nerasta
rmmer_1.noask: Kommando nicht gefunden.
rmmer_1.noask: kommandot finns inte
rmmer_1.noask: komut yok
rmmer_1.noask: nie znaleziono polecenia
rmmer_1.noask: níor aimsíodh an t-ordú
rmmer_1.noask: no se encontró la orden
rmmer_1.noask: no s'ha trobat l'ordre
rmmer_1.noask: opdracht niet gevonden
rmmer_1.noask: parancs nem található
rmmer_1.noask: perintah tidak ditemukan
rmmer_1.noask: príkaz nenájdený
rmmer_1.noask: příkaz nenalezen
rmmer_1.noask: команда не найдена
rmmer_1.noask: командата не е открита
rmmer_1.noask: 命令找不到
rmmer_1.noask: コマンドが見つかりません