iserial: 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

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/sbin/iserial - from package: ipmiutil

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