sdar: 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/sdar - from package: sdcc-ucsim

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