minimodem: 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 CentOS possible default full paths are:

/usr/bin/minimodem - from package: minimodem

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/minimodem - from package: minimodem

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

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