arcrename: 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/arcrename - from package: nordugrid-arc-client

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

On Debian possible default full paths are:

/usr/bin/arcrename - from package: nordugrid-arc-client

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

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