pfsview: 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/pfsview - from package: pfsview

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

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