asflip: 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/asflip - from package: libAfterImage-devel

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

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