trad2sim: 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/trad2sim - from package: gcin

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

Error in other languages:
trad2sim: bevel nie gevind nie
trad2sim: comandă negăsită
trad2sim: comando não encontrado
trad2sim: commande introuvable
trad2sim: command not found
trad2sim: käsku ei ole
trad2sim: không tìm thấy lệnh
trad2sim: komanda nerasta
trad2sim: Kommando nicht gefunden.
trad2sim: kommandot finns inte
trad2sim: komut yok
trad2sim: nie znaleziono polecenia
trad2sim: níor aimsíodh an t-ordú
trad2sim: no se encontró la orden
trad2sim: no s'ha trobat l'ordre
trad2sim: opdracht niet gevonden
trad2sim: parancs nem található
trad2sim: perintah tidak ditemukan
trad2sim: príkaz nenájdený
trad2sim: příkaz nenalezen
trad2sim: команда не найдена
trad2sim: командата не е открита
trad2sim: 命令找不到
trad2sim: コマンドが見つかりません