Some commands have been installed with the prefix g.
If you need to use these commands with their normal names, you can add some gnubin directory to your PATH from your ~/.bashrc or ~/.bash_profile like:
GNU_TOOLCHAIN=true
if $GNU_TOOLCHAIN; then
# base
export PATH="/usr/local/opt/coreutils/libexec/gnubin:$PATH"
export PATH="/usr/local/opt/findutils/libexec/gnubin:$PATH"
export PATH="/usr/local/opt/gawk/libexec/gnubin:$PATH"
export PATH="/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"
export PATH="/usr/local/opt/gnu-tar/libexec/gnubin:$PATH"
export PATH="/usr/local/opt/grep/libexec/gnubin:$PATH"
export MANPATH="/usr/local/opt/coreutils/libexec/gnuman:$MANPATH"
export MANPATH="/usr/local/opt/findutils/libexec/gnuman:$MANPATH"
export MANPATH="/usr/local/opt/gawk/libexec/gnuman:$MANPATH"
export MANPATH="/usr/local/opt/gnu-sed/libexec/gnuman:$MANPATH"
export MANPATH="/usr/local/opt/gnu-tar/libexec/gnuman:$MANPATH"
export MANPATH="/usr/local/opt/grep/libexec/gnuman:$MANPATH"
# base-devel
export PATH="/usr/local/opt/binutils/bin:$PATH"
export PATH="/usr/local/opt/gnu-which/libexec/gnubin:$PATH"
export MANPATH="/usr/local/opt/binutils/share/gnuman:$MANPATH"
export MANPATH="/usr/local/opt/gnu-which/libexec/gnuman:$MANPATH"
# others
#export PATH="/usr/local/opt/ed/libexec/gnubin:$PATH"
#export PATH="/usr/local/opt/gnu-indent/libexec/gnubin:$PATH"
#export MANPATH="/usr/local/opt/ed/libexec/gnuman:$MANPATH"
#export MANPATH="/usr/local/opt/gnu-indent/libexec/gnuman:$MANPATH"
fi