MTD 248-645A Manual de usuario descargar pdf (Pagina 48)

Linux From Scratch - Version 7.0

4.3. Adding the LFS User

When logged in as user root, making a single mistake can damage or destroy a system. Therefore, we recommend

building the packages in this chapter as an unprivileged user. You could use your own user name, but to make it easier

to set up a clean working environment, create a new user called lfs as a member of a new group (also named lfs)

and use this user during the installation process. As root, issue the following commands to add the new user:

groupadd lfs

useradd -s /bin/bash -g lfs -m -k /dev/null lfs

The meaning of the command line options:

-s /bin/bash

This makes bash the default shell for user lfs.

-g lfs

This option adds user lfs to group lfs.

-m

This creates a home directory for lfs.

-k /dev/null

This parameter prevents possible copying of files from a skeleton directory (default is /etc/skel) by changing

the input location to the special null device.

lfs

This is the actual name for the created group and user.

To log in as lfs (as opposed to switching to user lfs when logged in as root, which does not require the lfs

user to have a password), give lfs a password:

passwd lfs

Grant lfs full access to $LFS/tools by making lfs the directory owner:

chown -v lfs $LFS/tools

If a separate working directory was created as suggested, give user lfs ownership of this directory:

chown -v lfs $LFS/sources

Next, login as user lfs. This can be done via a virtual console, through a display manager, or with the following

substitute user command:

su - lfs

The “-” instructs su to start a login shell as opposed to a non-login shell. The difference between these two types of

shells can be found in detail in bash(1) and info bash.

4.4. Setting Up the Environment

Set up a good working environment by creating two new startup files for the bash shell. While logged in as user lfs,

issue the following command to create a new .bash_profile:

cat > ~/.bash_profile << "EOF"

exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash

EOF

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MTD 248-645A Manual de usuario Pagina 48