fracextract: 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/fracextract - from package: esys-particle

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

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