sds: 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/sds - from package: simh

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

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