kres-migrator: 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/kres-migrator - from package: kdepim-runtime

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

On Debian possible default full paths are:

/usr/bin/kres-migrator - from package: kdepim-runtime

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

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