These commands provide systemwide information and control. Normal users can run many commands to obtain system information; however, commands that actively change the configuration of the system need to run while you’re logged in as root — or have utilized the su command to temporarily become the superuser.
Some administration commands, shown in Table A-10, don’t fall neatly into a category.
|passwd||Change a particular user’s password. Any user can run this command to change their own password. Only root can use it to change someone else’s.|
|su||Switch to another user account without logging out of this one. The best way to use this command is su - so your filesystem path and other information is loaded.|
You may sometimes need to add kernel support for an additional device (software or hardware). If this need arises, you have a limited number of choices: You can either rebuild the kernel or install a loadable kernel module. Although rebuilding a kernel doesn’t exactly require a PhD in nuclear science, consider it a time-consuming nuisance that’s best to avoid. The commands in Table A-11 enable you to include the kernel support you need while the system is running, without having to rebuild the entire thing from scratch.
|depmod||Regenerates your module dependencies.|
|insmod||Loads a module by hand.|
|lsmod||Lists the modules your kernel has loaded. ...|