myisam_ftdump: 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/myisam_ftdump - from package: mysql55w-server
/usr/bin/myisam_ftdump - from package: mysql-server

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

On Debian possible default full paths are:

/usr/bin/myisam_ftdump - from package: mariadb-server-10.0
/usr/bin/myisam_ftdump - from package: mysql-client-5.5

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

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