Python-esque arguments for Bash. If you like this, check out https://github.com/akatrevorjay/bashism

getkwargs.sh

#!/bin/bash -e
# ____________
# getkwargs.sh
#
# -- Gives you simple Python-esque arguments in Bash
#    ie: your_function_or_script never=always sync daemon=True
#
# TODO Enhance interface with standard opts support: -p|--path[=blah]
#
# ~trevorj 05/05/2013


function getkwargs() {
    local -A kwargs=()
    local -a args=()

    local kw_re='^([a-zA-Z][a-zA-Z0-9_]*)=(.+)$'

    local k= v=
    for v in "$@"; do
        if [[ "$v" =~ $kw_re ]]; then
            kwargs[${BASH_REMATCH[1]}]="${BASH_REMATCH[2]}"
        else
            args[${#args[@]}]="$v"
        fi
    done

    ## Bash will munge the newlines during expansion if it's being expanded,
    ## so we need to make sure that there are no newlines, with a seperator.
    echo "$(declare -p args)"";""$(declare -p kwargs)"
}

getkwargs_example.sh

#!/bin/bash -e
##
## Example usage
##

. getkwargs.sh


function getkwargs_example() {
    # Turn off verbose mode
    set +v

    # Simple
    eval "$(getkwargs "$@")"

    # <br />
    echo

    # Print structure of args and kwargs
    declare -p args kwargs

    # Positional
    echo "First positional argument is \"${args[0]}\""
    echo "Second positional argument is \"${args[1]}\""

    # Keyword
    local k= v=
    for k in "${!kwargs[@]}"; do
        v="${kwargs[$k]}"
        echo "Keyword argument \"$k\"=\"$v\""
    done

    # <br />
    echo

    # Turn verbose mode back on
    set -v
}


# Turn on verbose mode to output what we're running below
set -v


getkwargs_example omg=yes=yes2 arg0 arg1 munch=faces=whatsits
getkwargs_example "omg=yes=yes2 arg0" "arg1 munch=faces=whatsits"
getkwargs_example "omg=yes=yes2 arg0" "arg1 munch=faces=whatsits"
getkwargs_example "omg=yes=yes2 arg0" "arg1 munch=faces=whatsits"