pfscat: command not found

Have You tried accessing the binary with the full path?

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/lib/debug/usr/bin/pfscat - from package: pfstools-dbg
/usr/bin/pfscat - from package: pfstools

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