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/usr/bin/linuxbrew is in linuxbrew-wrapper 20150804-3.

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The actual contents of the file can be viewed below.

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#!/bin/sh
# Linuxbrew wrapper for Debian Package
#
#   if detected linuxbrew instance at ${LINUXBREW_PREFIX}/.linuxbrew
#     run command, using existing brew
#   else 
#     install linuxbrew, then run command
#   end
#
# This script should be able to work outside of the Debian package.
#
# Copyright: 2015 Lumin <cdluminate@gmail.com>
# License:   BSD-2-Clause
set -e

# --- [ Check/Sync Environment ] ---
# here I use LINUXBREW_PREFIX as the major ENV,
# and HOMEBREW_PREFIX is for compatibility.
if [ -z ${LINUXBREW_PREFIX} ] && [ -z ${HOMEBREW_PREFIX}]; then
  # when both ENV are not set, use default.
  export LINUXBREW_PREFIX="${HOME}/.linuxbrew"
  export HOMEBREW_PREFIX=${LINUXBREW_PREFIX}
elif [ -z ${HOMEBREW_PREFIX} ];then
  # LINUXBREW_PREFIX is set.
  export HOMEBREW_PREFIX=${LINUXBREW_PREFIX}
elif [ -z ${LINUXBREW_PREFIX} ];then
  # HOMEBREW_PREFIX is set.
  export LINUXBREW_PREFIX=${HOMEBREW_PREFIX}
else #[ ! -z ${LINUXBREW_PREFIX} ] && [ ! -z ${HOMEBREW_PREFIX}]
  # both ENV are set (even if they are conflicting to each other),
  # then we use LINUXBREW_PREFIX.  And export nothing
  true
fi

export BREW_EXEC="${LINUXBREW_PREFIX}/bin/brew"   # real brew executable
export BREW_INSTALL="/usr/lib/linuxbrew-wrapper/install" # local linuxbrew install script
# upstream install script
export ORIGIN_INSTALL="https://raw.githubusercontent.com/Homebrew/linuxbrew/go/install"

first_time_hint () {
  printf "
========================================================================
You may want to update following environments after installed linuxbrew.

  PATH, MANPATH, INFOPATH 

(example: /usr/share/doc/linuxbrew-wrapper/examples/profile)
========================================================================
"
}

# root ?
if [ `whoami` = "root" ]; then
  # well, the upstream install script will stop when detected root.
  # However, not stopping users who created linuxbrew for root user.
  printf "W: be careful as root.\n"
fi

# ruby ?
if [ ! -x $(which ruby) ]; then
  printf "E: ruby interpreter not available, abort.\n"
  false
fi

# If there is brew instance available, just run it.
if [ -x ${BREW_EXEC} ]; then
  exec ${BREW_EXEC} $@
elif [ -d ${LINUXBREW_PREFIX} ]; then
  printf "E: Linuxbrew directory detected, but it seems to be broken.\n"
  printf "   Try to remove '${LINUXBREW_PREFIX}' and try again.\n"
  false
fi

# if it comes here, we first need to pull the linuxbrew with git.
if [ -r ${BREW_INSTALL} ]; then
    first_time_hint      # print hint at first
    ruby ${BREW_INSTALL} # install first
    exec ${BREW_EXEC} $@
else
  printf "I: Trying to download linuxbrew install script ...\n"
  first_time_hint      # print hint at first
  ruby -e "$(curl -fsSL ${ORIGIN_INSTALL})"
  exec ${BREW_EXEC} $@
fi