mysql_fix_privilege_tables: 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/mysql_fix_privilege_tables - from package: mysql-server

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

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