svm-scale: 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/svm-scale - from package: libsvm

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

On Debian possible default full paths are:

/usr/bin/svm-scale - from package: libsvm-tools

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

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