safestartkde: 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/safestartkde - from package: kdebase-workspace

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

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