arched: 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/sbin/arched - from package: nordugrid-arc-hed

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

On Debian possible default full paths are:

/usr/sbin/arched - from package: nordugrid-arc-hed
/usr/lib/debug/usr/sbin/arched - from package: nordugrid-arc-dbg

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

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