Use '/usr/bin/env bash' for portability.

bin/dist

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -o nounset -o errexit -o pipefail
 function usage {
 cat <<USAGE

bin/netbuild

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -o nounset -o errexit -o pipefail
 function usage {
 cat <<USAGE

bin/so2a4hs

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -o errexit -o nounset -o pipefail
 
 # Use LDD to find the shared libraries referenced by this executable.

model-scripts/binary-heredoc/xxdiff.bash

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -o nounset -o errexit -o pipefail
 
 function hex {