sealert: 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/sealert - from package: setroubleshoot-server

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

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