atasm: command not found

Have You tried accessing the binary with the full path?

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/atasm - from package: atasm

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