sol: 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/sol - from package: gnome-games

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

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