how can set permanunt aliases in sabayon o. s.

Have you tried putting them in .bash_aliases or .bashrc in your users home directory? In order for them to take affect you exit logout and back in again. I don't use sabayon however this works for RedHat/Fedora and Ubuntu distros.

Regards,

Fordeck

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but not found /etc/aliases configuration file in sabayon

Read though your bash startup scripts (bashrc, profile, bash_login) for a line that tests for an aliases file and runs it if it exists. You can create that file if it doesn't exist. Mine looks for ~/.aliases.

If it doesn't exist, you can add alias definitions to ~/.profile or ~/.bash_login whichever your system uses.
Lately, distros have system shell startup files in /etc/profile.d/.

On my system, my aliases are defined in /etc/bash.bashrc but since this file can be replaced in an update, /etc/bash.bashrc would be used for changes instead.

You could grep files in /etc/ looking for an alias you have.
E.G.:
grep "alias md='mkdir -p'" /etc/* 2>/dev/null