A little more info would help:
- What distro (and version) of Linux are you running?
-Which shell were you using before?
- Are you alluding to the fact that your system used to boot into a GUI directly, as opposed to putting you at the command line? It is important not to confuse a graphical (GUI) interface with a shell.
Here are a couple of ideas:
-There is no "normal Linux command line"; the command-line environment is totally dependent on which shell (bash, csh, tcsh, sh, etc.) you use. You can determine which shell you are currently running by typing (case-sensitivity applies):
You can use the "chsh" command to change each user's default shell.
- If you mean that your system used to boot directly into X (the GUI), but for some reason it now just dumps you to a command prompt, you need to edit your /etc/inittab file to re-enable booting to the GUI. I use vi as a command-line editor, so as an example, do the following (as root):
-type "vi /etc/inittab" (no quotes) # the file should then be displayed
-find the line near the begining of the file which reads something like "id:<some number>:initdefault:". Directly above that should be a description of the different run levels, which corresponed to the value of <some number> in my example above. Runlevel 5 is usually the entry which will boot you directly into the X GUI, but it may be different for your distro.
- If you need to edit the value, hit the insert key (to enter insert mode) and replace the value in <some number> with the value you want. To save the changes and exit, hit <ESC>, then type ":wq" (again, no qoutes).
-log out and log back in. You should be taken to the GUI automatically.