create_chromium_user_agent.sh

#!/bin/bash

platform='Macintosh; '
os_cpu=$(sw_vers 2>/dev/null | grep ProductVersion | sed 's/^ProductVersion:.\(.*\)/\1/g' | tr . _)

TMP=$(mktemp -t tmp)
trap "rm $TMP" EXIT

curl https://chromium.googlesource.com/chromium/src/+/master/content/webkit_version.h.in 2>/dev/null | sed 's:</[^>]*>: :g' | sed 's:<[^>]*>: :g' > "$TMP"
WEBKIT_VERSION_MAJOR=$(cat "$TMP" | sed 's:^.*WEBKIT_VERSION_MAJOR[ ]*\([0-9]*\).*$:\1:g')
WEBKIT_VERSION_MINOR=$(cat "$TMP" | sed 's:^.*WEBKIT_VERSION_MINOR[ ]*\([0-9]*\).*$:\1:g')

curl https://chromium.googlesource.com/chromium/src.git/+/master/chrome/VERSION 2>/dev/null | sed 's:</[^>]*>: :g' | sed 's:<[^>]*>: :g' > "$TMP"
MAJOR=$(cat "$TMP" |  sed 's:^.*MAJOR *= *\([0-9]*\).*$:\1:g')
MINOR=$(cat "$TMP" |  sed 's:^.*MINOR *= *\([0-9]*\).*$:\1:g')
BUILD=$(cat "$TMP" |  sed 's:^.*BUILD *= *\([0-9]*\).*$:\1:g')
PATCH=$(cat "$TMP" |  sed 's:^.*PATCH *= *\([0-9]*\).*$:\1:g')
product=$(printf 'Chrome/%d.%d.%d.%d' $MAJOR $MINOR $BUILD $PATCH)

printf 'Mozilla/5.0 (Macintosh; Intel Mac OS X %s) AppleWebKit/%d.%d (KHTML, like Gecko) %s Safari/%d.%d' "$os_cpu" "$WEBKIT_VERSION_MAJOR" "$WEBKIT_VERSION_MINOR" "$product" "$WEBKIT_VERSION_MAJOR" "$WEBKIT_VERSION_MINOR"
echo