clog2TOslog2: 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/clog2TOslog2 - from package: mpich2-devel
/usr/lib/mpich2/bin/clog2TOslog2 - from package: mpich2-devel
/usr/lib64/mvapich/bin/clog2TOslog2 - from package: mvapich
/usr/lib/mvapich/bin/clog2TOslog2 - from package: mvapich

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

Error in other languages:
clog2TOslog2: bevel nie gevind nie
clog2TOslog2: comandă negăsită
clog2TOslog2: comando não encontrado
clog2TOslog2: commande introuvable
clog2TOslog2: command not found
clog2TOslog2: käsku ei ole
clog2TOslog2: không tìm thấy lệnh
clog2TOslog2: komanda nerasta
clog2TOslog2: Kommando nicht gefunden.
clog2TOslog2: kommandot finns inte
clog2TOslog2: komut yok
clog2TOslog2: nie znaleziono polecenia
clog2TOslog2: níor aimsíodh an t-ordú
clog2TOslog2: no se encontró la orden
clog2TOslog2: no s'ha trobat l'ordre
clog2TOslog2: opdracht niet gevonden
clog2TOslog2: parancs nem található
clog2TOslog2: perintah tidak ditemukan
clog2TOslog2: príkaz nenájdený
clog2TOslog2: příkaz nenalezen
clog2TOslog2: команда не найдена
clog2TOslog2: командата не е открита
clog2TOslog2: 命令找不到
clog2TOslog2: コマンドが見つかりません