mysqlmetagrep: 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/bin/mysqlmetagrep - from package: mysql-utilities

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

On Debian possible default full paths are:

/usr/bin/mysqlmetagrep - from package: mysql-utilities

You may install the required package with command apt-get install {package}

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