fftprof: 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/fftprof - from package: abinit

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

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