svdir: 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/svdir - from package: svtools

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