fitgcp: 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/fitgcp - from package: fitgcp

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

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