evol: 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/evol - from package: python2-ProDy

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

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