mk-checksum-filter: 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/mk-checksum-filter - from package: maatkit

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

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