stimfit: 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/stimfit - from package: stimfit

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

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