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

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

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