artsdsp: 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/artsdsp - from package: arts

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

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