clog2alog: 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/mvapich/bin/clog2alog - from package: mvapich
/usr/lib/mvapich/bin/clog2alog - from package: mvapich

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

Error in other languages:
clog2alog: bevel nie gevind nie
clog2alog: comandă negăsită
clog2alog: comando não encontrado
clog2alog: commande introuvable
clog2alog: command not found
clog2alog: käsku ei ole
clog2alog: không tìm thấy lệnh
clog2alog: komanda nerasta
clog2alog: Kommando nicht gefunden.
clog2alog: kommandot finns inte
clog2alog: komut yok
clog2alog: nie znaleziono polecenia
clog2alog: níor aimsíodh an t-ordú
clog2alog: no se encontró la orden
clog2alog: no s'ha trobat l'ordre
clog2alog: opdracht niet gevonden
clog2alog: parancs nem található
clog2alog: perintah tidak ditemukan
clog2alog: príkaz nenájdený
clog2alog: příkaz nenalezen
clog2alog: команда не найдена
clog2alog: командата не е открита
clog2alog: 命令找不到
clog2alog: コマンドが見つかりません