slog2navigator: 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/lib64/mpich2/bin/slog2navigator - from package: mpich2-devel
/usr/lib/mpich2/bin/slog2navigator - from package: mpich2-devel
/usr/lib64/mvapich/bin/slog2navigator - from package: mvapich
/usr/lib/mvapich/bin/slog2navigator - from package: mvapich

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

Error in other languages:
slog2navigator: bevel nie gevind nie
slog2navigator: comandă negăsită
slog2navigator: comando não encontrado
slog2navigator: commande introuvable
slog2navigator: command not found
slog2navigator: käsku ei ole
slog2navigator: không tìm thấy lệnh
slog2navigator: komanda nerasta
slog2navigator: Kommando nicht gefunden.
slog2navigator: kommandot finns inte
slog2navigator: komut yok
slog2navigator: nie znaleziono polecenia
slog2navigator: níor aimsíodh an t-ordú
slog2navigator: no se encontró la orden
slog2navigator: no s'ha trobat l'ordre
slog2navigator: opdracht niet gevonden
slog2navigator: parancs nem található
slog2navigator: perintah tidak ditemukan
slog2navigator: príkaz nenájdený
slog2navigator: příkaz nenalezen
slog2navigator: команда не найдена
slog2navigator: командата не е открита
slog2navigator: 命令找不到
slog2navigator: コマンドが見つかりません