sdcc-sdar: 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 CentOS possible default full paths are:

/usr/bin/sdcc-sdar - from package: sdcc

You may install the required package with command yum install {package}

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