如何为git rebase选择合并策略？

这是完整的脚本:

#!/bin/bash
#
# git-rebase-theirs - Resolve rebase conflicts by favoring 'theirs' version
#
#    Copyright (C) 2012 Rodrigo Silva (MestreLion) 
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program. If not see 

#Defaults:
verbose=0
backup=1
inplace=0
ext=".bak"

message() { printf "%s\n" "$1" >&2 ; }
skip()    { message "skipping ${2:-$file}${1:+: $1}"; continue ; }
argerr()  { printf "%s: %s\n" "$myname" "${1:-error}" >&2 ; usage 1 ; }
invalid() { argerr "invalid option: $1" ; }
missing() { argerr "missing${1:+ $1} operand." ; }

usage() {
    cat <<- USAGE
    Usage: $myname [options] [--] FILE...
    USAGE
    if [[ "$1" ]] ; then
        cat >&2 <<- USAGE
        Try '$myname --help' for more information.
        USAGE
        exit 1
    fi
    cat <<-USAGE

    Resolve git rebase conflicts in FILE(s) by favoring 'theirs' version

    When using git rebase, conflicts are usually wanted to be resolved
    by favoring the  version (the branch being rebased,
    'theirs' side in a rebase), instead of the  version (the
    base branch, 'ours' side)

    But git rebase --strategy -X theirs is only available from git 1.7.3
    For older versions, $myname is the solution.

    It works by discarding all lines between '<<<<<<< HEAD' and '========'
    inclusive, and also the the '>>>>>> commit' marker.

    By default it outputs to stdout, but files can be edited in-place
    using --in-place, which, unlike sed, creates a backup by default.

    Options:
      -h|--help            show this page.
      -v|--verbose         print more details in stderr.

      --in-place[=SUFFIX]  edit files in place, creating a backup with
                           SUFFIX extension. Default if blank is ""$ext"

       --no-backup         disables backup

    Copyright (C) 2012 Rodrigo Silva (MestreLion) 
    License: GPLv3 or later. See 
    USAGE
    exit 0
}
myname="${0##*/}"

# Option handling
files=()
while (( $# )); do
    case "$1" in
    -h|--help     ) usage            ;;
    -v|--verbose  ) verbose=1        ;;
    --no-backup   ) backup=0         ;;
    --in-place    ) inplace=1        ;;
    --in-place=*  ) inplace=1
                    suffix="${1#*=}" ;;
    -*            ) invalid "$1"     ;;
    --            ) shift ; break    ;;
    *             ) files+=( "$1" )  ;;
    esac
    shift
done
files+=( "$@" )

(( "${#files[@]}" )) || missing "FILE"

ext=${suffix:-$ext}

for file in "${files[@]}"; do

    [[ -f "$file" ]] || skip "not a valid file"

    if ((inplace)); then
        outfile=$(tempfile) || skip "could not create temporary file"
        trap 'rm -f -- "$outfile"' EXIT
        cp "$file" "$outfile" || skip
        exec 3>"$outfile"
    else
        exec 3>&1
    fi

    # Do the magic :)
    awk '/^<+ HEAD$/,/^=+$/{next} /^>+ /{next} 1' "$file" >&3

    exec 3>&-

    ((inplace)) || continue

    diff "$file" "$outfile" >/dev/null && skip "no conflict markers found"

    ((backup)) && { cp "$file" "$file$ext" || skip "could not backup" ; }

    cp "$outfile" "$file" || skip "could not edit in-place"

    ((verbose)) && message "resolved ${file}"
done