artsmessage: 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/artsmessage - from package: kdelibs3

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

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