catfish.py: 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/share/catfish/bin/catfish.py - from package: catfish

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

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