--enable-static-link: This configure option causes Bash to be linked statically --prefix=$LFS/usr: This configure option installs all of Bash's files under the $LFS/usr directory, which becomes the /usr directory after the user chroot'ed into $LFS or when he rebooted the system into LFS. --bindir=$LFS/bin: This installs the executable files in $LFS/bin. We do this because we want bash to be in /bin, not in /usr/bin. One reason being: the /usr partition might be on a separate partition which has to be mounted at some point. Before that partition is mounted a user needs and will want to have bash available (it will be hard to execute the boot scripts without a shell for instance). ln -s bash sh: This command creates the sh symlink that points to bash. Most scripts run themselves via 'sh' (invoked by the #!/bin/sh as the first line in the scripts) which invokes a special bash mode. Bash will then behave (as closely as possible) as the original Bourne shell. The &&'s at the end of every line cause the next command to be executed only if the previous command exists with a return value of 0 indicating success. In case all of these commands are copy&pasted on the shell, is is important to be ensured that if ./configure fails, make isn't being executed and, likewise, if make fails, that make install isn't being executed, and so forth.