catfish: 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/catfish - from package: catfish

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

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