simpos: 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/simpos - from package: wcstools

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