GNUBINS=$(find -L /usr/local/opt -type d -name gnubin | tr ' ' ':')
export PATH=$GNUBINS:$PATH

[admin@nzx-mb-125:/opt/boxen/homebrew/bin] : ls -l | grep -i awk
lrwxr-xr-x  1 admin  staff   28 16 Dec 16:51 awk -> ../Cellar/gawk/4.1.0/bin/awk
lrwxr-xr-x  1 admin  staff   29 16 Dec 16:51 gawk -> ../Cellar/gawk/4.1.0/bin/gawk
lrwxr-xr-x  1 admin  staff   35 16 Dec 16:51 gawk-4.1.0 -> ../Cellar/gawk/4.1.0/bin/gawk-4.1.0
lrwxr-xr-x  1 admin  staff   30 16 Dec 16:51 igawk -> ../Cellar/gawk/4.1.0/bin/igawk
[admin@nzx-mb-125:/opt/boxen/homebrew/bin] : ls -l | grep -i sed
lrwxr-xr-x  1 admin  staff   31 16 Dec 16:52 sed -> ../Cellar/gnu-sed/4.2.2/bin/sed