Simple bash script to copy the config from one heroku app to another

copy_heroku_config.sh

#!/bin/bash
OIFS=$IFS
print_usage ()
{
    echo "Usage:"
    echo "     $0 source-appname"
    echo "     $0 source-appname dest-appname"
}

cleanup_and_exit ()
{
    IFS=$OIFS
    exit 1
}
if [ "$#" -lt 1 ]; then
    echo "Expected at least one parameter: appname"
    print_usage
    exit 1
fi

if [[ "$1" == "-h" || "$1" == "--help" ]]; then
    print_usage
    exit 0
fi

from_config=$(heroku config -s -a $1)
if [[ $? != 0 ]] ; then
    echo "Error retreiving config"
    echo $from_config
    cleanup_and_exit
fi

IFS=$'\n'
config_vars=( $from_config )
to_config=""
count=0
pstr="[=======================================================================]"
total=${#config_vars[@]}
for ((i=0; i<${#config_vars[@]}; ++i));
do
    row=${config_vars[$i]}
    kvp=$(echo $row | tr -s "=" "\n")
    kvp=( $kvp )
    key=${kvp[0]}
    value=$(heroku config:get ${kvp[0]} -a $1)

    if [[ $? != 0 ]] ; then
        printf "\n"
        echo "Error retreiving config"
        echo $value
        cleanup_and_exit
    fi

    if [ -z "$to_config" ]; then
        to_config="$key=\"$value\""
    else
        to_config="$to_config $key=\"$value\""
    fi
    count=$(( $count + 1 ))
    pd=$(( $count * 73 / $total ))
    printf "\r%3d.%1d%% %.${pd}s" $(( $count * 100 / $total )) $(( ($count * 1000 / $total) % 10 )) $pstr
done

IFS=$OIFS
printf "\n"

if [ "$#" -gt 1 ]; then
    command="heroku config:set $to_config -a $2"
    echo "$command"
    eval $command
else
    echo $to_config
    echo "done"
fi