pyreverse: 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/pyreverse - from package: pylint

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

On Debian possible default full paths are:

/usr/bin/pyreverse - from package: pylint

You may install the required package with command apt-get install {package}

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