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

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

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