kapplymousetheme: 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/kapplymousetheme - from package: kdebase-workspace

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

On Debian possible default full paths are:

/usr/bin/kapplymousetheme - from package: kde-workspace-bin

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

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