cat > ~/.bash_profile << "EOF"
exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash
EOF
Linux From Scratch - Version 6.7
28
When logged on as user lfs, the initial shell is usually a login shell which reads the / etc/ profile of the
host (probably containing some settings and environment variables) and then . bash_ profile. The exec env
-i.../bin/bash command in the . bash_ profile file replaces the running shell with a new one with a completely
empty environment, except for the HOME, TERM, and PS1 variables. This ensures that no unwanted and potentially
hazardous environment variables from the host system leak into the build environment. The technique used here
achieves the goal of ensuring a clean environment.
The new instance of the shell is a non-login shell, which does not read the / etc/ profile or . bash_ profile
files, but rather reads the . bashrc file instead. Create the . bashrc file now:
cat > ~/.bashrc << "EOF"
set +h
umask 022
LFS=/mnt/lfs
LC_ALL=POSIX
LFS_TGT=$(uname -m)-lfs-linux-gnu
PATH=/tools/bin:/bin:/usr/bin
export LFS LC_ALL LFS_TGT PATH
EOF
The se