Install Bash by running the following commands:
./configure --enable-static-link --prefix=$LFS/usr \
--bindir=$LFS/bin --disable-nls --with-curses &&
make &&
make install &&
cd $LFS/bin &&
ln -s bash sh
The Bash package contains the bash program
Bash is the Bourne-Again SHell, which is a widely used command interpreter on Unix systems. Bash is a program that reads from standard input, the keyboard. You type something and the program will evaluate what you have typed and do something with it, like running a program.