Dircmp - compare folders with cmp and output the files that are different - great for creating "delta" archives

dircmp.m4

#!/bin/bash
#
# This is a positional arguments-only example of Argbash potential
#
# ARG_HELP([The general script's help msg])
# ARG_POSITIONAL_SINGLE([changed], [The directory with changed contents])
# ARG_POSITIONAL_SINGLE([unchanged], [The directory with unchanged contents])
# ARGBASH_GO

# [ <-- needed because of Argbash

orgdir=$PWD
changed=$(realpath $_arg_changed)
unchanged=$(realpath $_arg_unchanged)

cd $changed

find . -type f -print0 |sed "s#'#\\\'#g"| xargs -0 -i bash -c "cmp -s {} ${unchanged}/{} 2>/dev/null ; if [ \$? -ne 0 ]; then echo {} ;fi"

cd $orgdir

# ] <-- needed because of Argbash

dircmp.sh

#!/bin/bash
#
# This is a positional arguments-only example of Argbash potential
#
# ARG_HELP([The general script's help msg])
# ARG_POSITIONAL_SINGLE([changed],[The directory with changed contents])
# ARG_POSITIONAL_SINGLE([unchanged],[The directory with unchanged contents])
# ARGBASH_GO()
# needed because of Argbash --> m4_ignore([
### START OF CODE GENERATED BY Argbash v2.6.1 one line above ###
# Argbash is a bash code generator used to get arguments parsing right.
# Argbash is FREE SOFTWARE, see https://argbash.io for more info

die()
{
        local _ret=$2
        test -n "$_ret" || _ret=1
        test "$_PRINT_HELP" = yes && print_help >&2
        echo "$1" >&2
        exit ${_ret}
}

begins_with_short_option()
{
        local first_option all_short_options
        all_short_options='h'
        first_option="${1:0:1}"
        test "$all_short_options" = "${all_short_options/$first_option/}" && return 1 || return 0
}



# THE DEFAULTS INITIALIZATION - POSITIONALS
_positionals=()
# THE DEFAULTS INITIALIZATION - OPTIONALS

print_help ()
{
        printf '%s\n' "The general script's help msg"
        printf 'Usage: %s [-h|--help] <changed> <unchanged>\n' "$0"
        printf '\t%s\n' "<changed>: The directory with changed contents"
        printf '\t%s\n' "<unchanged>: The directory with unchanged contents"
        printf '\t%s\n' "-h,--help: Prints help"
}

parse_commandline ()
{
        while test $# -gt 0
        do
                _key="$1"
                case "$_key" in
                        -h|--help)
                                print_help
                                exit 0
                                ;;
                        -h*)
                                print_help
                                exit 0
                                ;;
                        *)
                                _positionals+=("$1")
                                ;;
                esac
                shift
        done
}


handle_passed_args_count ()
{
        _required_args_string="'changed' and 'unchanged'"
        test ${#_positionals[@]} -ge 2 || _PRINT_HELP=yes die "FATAL ERROR: Not enough positional arguments - we require exactly 2 (namely: $_required_args_string), but got only ${#_positionals[@]}." 1
        test ${#_positionals[@]} -le 2 || _PRINT_HELP=yes die "FATAL ERROR: There were spurious positional arguments --- we expect exactly 2 (namely: $_required_args_string), but got ${#_positionals[@]} (the last one was: '${_positionals[*]: -1}')." 1
}

assign_positional_args ()
{
        _positional_names=('_arg_changed' '_arg_unchanged' )

        for (( ii = 0; ii < ${#_positionals[@]}; ii++))
        do
                eval "${_positional_names[ii]}=\${_positionals[ii]}" || die "Error during argument parsing, possibly an Argbash bug." 1
        done
}

parse_commandline "$@"
handle_passed_args_count
assign_positional_args

# OTHER STUFF GENERATED BY Argbash

### END OF CODE GENERATED BY Argbash (sortof) ### ])
# [ <-- needed because of Argbash


orgdir=$PWD
changed=$(realpath $_arg_changed)
unchanged=$(realpath $_arg_unchanged)

cd $changed

find . -type f -print0 |sed "s#'#\\\'#g"| xargs -0 -i bash -c "cmp -s {} ${unchanged}/{} 2>/dev/null ; if [ \$? -ne 0 ]; then echo {} ;fi"

cd $orgdir

# ] <-- needed because of Argbash