sim2trad: command not found

Have You tried accessing the binary with the full path?

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/sim2trad - from package: gcin

You may install the required package with command apt-get install {package}
Error in other languages:
sim2trad: bevel nie gevind nie
sim2trad: comandă negăsită
sim2trad: comando não encontrado
sim2trad: commande introuvable
sim2trad: command not found
sim2trad: käsku ei ole
sim2trad: không tìm thấy lệnh
sim2trad: komanda nerasta
sim2trad: Kommando nicht gefunden.
sim2trad: kommandot finns inte
sim2trad: komut yok
sim2trad: nie znaleziono polecenia
sim2trad: níor aimsíodh an t-ordú
sim2trad: no se encontró la orden
sim2trad: no s'ha trobat l'ordre
sim2trad: opdracht niet gevonden
sim2trad: parancs nem található
sim2trad: perintah tidak ditemukan
sim2trad: príkaz nenájdený
sim2trad: příkaz nenalezen
sim2trad: команда не найдена
sim2trad: командата не е открита
sim2trad: 命令找不到
sim2trad: コマンドが見つかりません