extract: 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 - from package: extract

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

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