if1: 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/if1 - from package: ctsim

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

Error in other languages:
if1: bevel nie gevind nie
if1: comandă negăsită
if1: comando não encontrado
if1: commande introuvable
if1: command not found
if1: käsku ei ole
if1: không tìm thấy lệnh
if1: komanda nerasta
if1: Kommando nicht gefunden.
if1: kommandot finns inte
if1: komut yok
if1: nie znaleziono polecenia
if1: níor aimsíodh an t-ordú
if1: no se encontró la orden
if1: no s'ha trobat l'ordre
if1: opdracht niet gevonden
if1: parancs nem található
if1: perintah tidak ditemukan
if1: príkaz nenájdený
if1: příkaz nenalezen
if1: команда не найдена
if1: командата не е открита
if1: 命令找不到
if1: コマンドが見つかりません