mysqldbcompare: 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/mysqldbcompare - from package: mysql-utilities

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

On Debian possible default full paths are:

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

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

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