solis: 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:

/sbin/solis - from package: nut

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