as86: 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/as86 - from package: dev86

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

On Debian possible default full paths are:

/usr/bin/as86 - from package: bin86

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

Error in other languages:
as86: bevel nie gevind nie
as86: comandă negăsită
as86: comando não encontrado
as86: commande introuvable
as86: command not found
as86: käsku ei ole
as86: không tìm thấy lệnh
as86: komanda nerasta
as86: Kommando nicht gefunden.
as86: kommandot finns inte
as86: komut yok
as86: nie znaleziono polecenia
as86: níor aimsíodh an t-ordú
as86: no se encontró la orden
as86: no s'ha trobat l'ordre
as86: opdracht niet gevonden
as86: parancs nem található
as86: perintah tidak ditemukan
as86: príkaz nenájdený
as86: příkaz nenalezen
as86: команда не найдена
as86: командата не е открита
as86: 命令找不到
as86: コマンドが見つかりません