MacOS script for loading system proxy setting at bash and git

proxy_config.sh

#!/bin/bash

proxyToFile() {
    local filename="$2"
    # break if filename not found
    if [[ ! -f $filename ]]; then return -1; fi

    local add="$1"
    if [[ "$add" = "true" ]]; then
        perl -pi -e 's/^#http/http/' $filename
    else
        perl -pi -e 's/^http/#http/' $filename
    fi
}

prxyIP=$(system_profiler SPNetworkDataType | grep "HTTP Proxy Server" | awk '{print $4}' | head -1)
prxyPort=$(system_profiler SPNetworkDataType | grep "HTTP Proxy Port" | awk '{print $4}' | head -1)
if [ ! -z ${prxyIP} ] && [ ${prxyIP} != "0" ]
then

    prxyCfg="http://${prxyIP}:${prxyPort}"
    prxy="${prxyIP}:${prxyPort}"

    export http_proxy="${prxyCfg}"
    export HTTP_PROXY="${prxyCfg}"
    export https_proxy="${prxyCfg}"
    export HTTPS_PROXY="${prxyCfg}"
    export ALL_PROXY=${prxy}
    export all_proxy=${prxy}

    # Set proxy at git config
    git config --global http.proxy ${HTTP_PROXY}
    git config --global https.proxy ${HTTPS_PROXY}

    # curl -x <proxy_host>:<proxy_port>
    alias curl="curl -x '${prxy}'"

    # Uncomment proxy from Ruby config
    proxyToFile true ~/.gemrc

    echo "Configured proxy $HTTPS_PROXY"
else
    unset http_proxy
    unset HTTP_PROXY
    unset https_proxy
    unset HTTPS_PROXY

    # Remove proxy from git config
    git config --global --unset http.proxy
    git config --global --unset https.proxy

    # Comment proxy at Ruby config
    proxyToFile false ~/.gemrc

fi

To use it add in your .bashrc or .bash_profile

if [ -f ~/path/of/proxy_config.sh ]; then source ~/path/of/proxy_config.sh; fi