sdcc-sst7: 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-sst7 - from package: sdcc

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

Error in other languages:
sdcc-sst7: bevel nie gevind nie
sdcc-sst7: comandă negăsită
sdcc-sst7: comando não encontrado
sdcc-sst7: commande introuvable
sdcc-sst7: command not found
sdcc-sst7: käsku ei ole
sdcc-sst7: không tìm thấy lệnh
sdcc-sst7: komanda nerasta
sdcc-sst7: Kommando nicht gefunden.
sdcc-sst7: kommandot finns inte
sdcc-sst7: komut yok
sdcc-sst7: nie znaleziono polecenia
sdcc-sst7: níor aimsíodh an t-ordú
sdcc-sst7: no se encontró la orden
sdcc-sst7: no s'ha trobat l'ordre
sdcc-sst7: opdracht niet gevonden
sdcc-sst7: parancs nem található
sdcc-sst7: perintah tidak ditemukan
sdcc-sst7: príkaz nenájdený
sdcc-sst7: příkaz nenalezen
sdcc-sst7: команда не найдена
sdcc-sst7: командата не е открита
sdcc-sst7: 命令找不到
sdcc-sst7: コマンドが見つかりません