pfsv: 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/pfsv - from package: pfsview

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

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