gistfile1.sh

urlencode() {                                                                   
    # urlencode <string>                                                        
                                                                                
    local length="${#1}"                                                        
    for (( i = 0 ; i < length ; i++ )); do                                      
        local c="${1:i:1}"                                                      
        case "$c" in                                                            
            [a-zA-Z0-9.~_-]) printf "$c" ;;                                     
            ' ') printf + ;;                                                    
            *) printf '%%%X' "'$c"                                              
        esac                                                                    
    done                                                                        
}                                                                               
                                                                                
urldecode() {                                                                   
    # urldecode <string>                                                        
                                                                                
    local url_encoded=${1//+/ }                                                 
    printf '%b' "${url_encoded//%/\x}"                                          
}