sffview: 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/sffview - from package: sffview

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

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