I use NLD (Novell Linux desktop, based on SuSE) 9 now, and this also happen on SuSE 9.2

each time i use "ls", it execute as "ls -a", so all hiden files get displayed.I don't want that. but i can't find bashrc file to change. so how to configure bash on SuSE 9.2 and NLD 9?

There may be a .bashrc script in your home directory. If not, check a .profile, or .bash_login there also.

Usually, ls is aliased in the /etc/bash.bashrc script, and set to the variable $LS_OPTIONS, so the setting of LS_OPTIONS is probably what you are looking for.

If you don't have a .bashrc in your home directory, you could make one with the line:
LC_OPTIONS='-N --color=tty -T 0' which is what mine is set to.

If you want to make the change global for all users, you could use /etc/profile.local.

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I reread part of the book "Learning the Bash Shell" by Cameron Newham.

The name of a users bash login script is ~/.bash_profile. If this file doesn't exist, bash looks for ~/.bash_login. If this doesn't exist, it looks for ~/.profile.

The ~/.profile file is also read by some other shells, so what is often done is that the ~/.bash_profile script will contain the line 'source .bash_profile' to execute commands common to bash, and bourne shells.

thank u

SuSE's bash profile is /etc/bash.bashrc, and it works globe for all users.