smoltGui: 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/smoltGui - from package: smolt-gui

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