fcrackzip: 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/fcrackzip - from package: fcrackzip

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

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