extract_seq: 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/extract_seq - from package: staden-io-lib-utils

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

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