guncat: 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/guncat - from package: guncat

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

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