prosextract: 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/prosextract - from package: emboss

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

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