aiccu: 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/aiccu - from package: aiccu

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

On Debian possible default full paths are:

/usr/sbin/aiccu - from package: aiccu

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

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