mstar: 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 CentOS possible default full paths are:

/usr/bin/mstar - from package: mined

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