kttsmgr: 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/kttsmgr - from package: kdeaccessibility

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

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