unzix: 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 CentOS possible default full paths are:

/usr/bin/unzix - from package: unzix

You may install the required package with command yum install {package}

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