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

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

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