pfsouttiff: 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/pfsouttiff - from package: pfstools

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

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