kmmatch: 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/kmmatch - from package: kdesdk

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

On Debian possible default full paths are:

/usr/bin/kmmatch - from package: kmtrace

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

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