slog2updater: 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:

/usr/lib64/mpich2/bin/slog2updater - from package: mpich2-devel
/usr/lib/mpich2/bin/slog2updater - from package: mpich2-devel

You may install the required package with command yum install {package}
Error in other languages:
slog2updater: bevel nie gevind nie
slog2updater: comandă negăsită
slog2updater: comando não encontrado
slog2updater: commande introuvable
slog2updater: command not found
slog2updater: käsku ei ole
slog2updater: không tìm thấy lệnh
slog2updater: komanda nerasta
slog2updater: Kommando nicht gefunden.
slog2updater: kommandot finns inte
slog2updater: komut yok
slog2updater: nie znaleziono polecenia
slog2updater: níor aimsíodh an t-ordú
slog2updater: no se encontró la orden
slog2updater: no s'ha trobat l'ordre
slog2updater: opdracht niet gevonden
slog2updater: parancs nem található
slog2updater: perintah tidak ditemukan
slog2updater: príkaz nenájdený
slog2updater: příkaz nenalezen
slog2updater: команда не найдена
slog2updater: командата не е открита
slog2updater: 命令找不到
slog2updater: コマンドが見つかりません