skipsetup.sh

#!/bin/sh
write_prefs(){

    local folder=$1

    if [ -z "${folder}" ];  then
        echo "you must specify a path to write prefs"
        exit -1
    fi
    darwin_major_version="$(uname -r | cut -d '.' -f 1)" # 17 = 10.13, 18 = 10.14, 19 = 10.15, 20 = 11.0, etc.

    # The following keys can be retrieved/verified with the command: strings '/System/Library/CoreServices/Setup Assistant.app/Contents/MacOS/Setup Assistant' | grep '^DidSee' | sort
    # These are the keys that are common to all macOS version 10.13 and newer. Other OS version specific keys will be added below.
    setupassistant_did_see_pref_keys=( 'DidSeeApplePaySetup' 'DidSeeAvatarSetup' 'DidSeeCloudSetup' 'DidSeeiCloudLoginForStorageServices' 'DidSeePrivacy' 'DidSeeSiriSetup' 'DidSeeSyncSetup' 'DidSeeSyncSetup2' 'DidSeeTouchIDSetup' )

    if (( darwin_major_version == 17 )); then
        setupassistant_did_see_pref_keys+=( 'DidSeeTrueTonePrivacy' ) # Only exists in macOS 10.13, I believe it was a typo and replaced with "DidSeeTrueTone" in macOS 10.14.
    elif (( darwin_major_version >= 18 )); then
        setupassistant_did_see_pref_keys+=( 'DidSeeAppearanceSetup' 'DidSeeTrueTone' ) # Added in macOS 10.14.

        if (( darwin_major_version >= 19 )); then
            setupassistant_did_see_pref_keys+=( 'DidSeeActivationLock' 'DidSeeScreenTime' ) # Added in macOS 10.15.

            if (( darwin_major_version >= 20 )); then
                setupassistant_did_see_pref_keys+=( 'DidSeeAccessibility' 'DidSeeAppStore' ) # Added in macOS 11.
            fi
        fi
    fi

    for this_setupassistant_did_see_pref_key in "${setupassistant_did_see_pref_keys[@]}"; do
        defaults write "${folder}/Library/Preferences/com.apple.SetupAssistant" "${this_setupassistant_did_see_pref_key}" -bool true
    done

    # The following keys can be retrieved/verified with the command: strings '/System/Library/CoreServices/Setup Assistant.app/Contents/MacOS/Setup Assistant' | grep '^LastSeen' | sort
    defaults write "${folder}/Library/Preferences/com.apple.SetupAssistant" LastSeenBuddyBuildVersion -string "$(sw_vers -buildVersion)"

    # These are the keys that are common to all macOS version 10.13 and newer. Other OS version specific keys will be added below.
    setupassistant_last_seen_pref_keys=( 'LastSeenCloudProductVersion' 'LastSeeniCloudStorageServicesProductVersion' 'LastSeenSyncProductVersion' )

    if (( darwin_major_version >= 19 )); then
        setupassistant_last_seen_pref_keys+=( 'LastSeenDiagnosticsProductVersion' 'LastSeenSiriProductVersion' ) # Added in macOS 10.15.
    fi

    os_version="$(sw_vers -productVersion)"

    for this_setupassistant_last_seen_pref_key in "${setupassistant_last_seen_pref_keys[@]}"; do
        defaults write "${folder}/Library/Preferences/com.apple.SetupAssistant" "${this_setupassistant_last_seen_pref_key}" -string "${os_version}"
    done

}

darwin_major_version="$(uname -r | cut -d '.' -f 1)" # 17 = 10.13, 18 = 10.14, 19 = 10.15, 20 = 11.0, etc.

# The following keys can be retrieved/verified with the command: strings '/System/Library/CoreServices/Setup Assistant.app/Contents/MacOS/Setup Assistant' | grep '^DidSee' | sort
# These are the keys that are common to all macOS version 10.13 and newer. Other OS version specific keys will be added below.
setupassistant_did_see_pref_keys=( 'DidSeeApplePaySetup' 'DidSeeAvatarSetup' 'DidSeeCloudSetup' 'DidSeeiCloudLoginForStorageServices' 'DidSeePrivacy' 'DidSeeSiriSetup' 'DidSeeSyncSetup' 'DidSeeSyncSetup2' 'DidSeeTouchIDSetup' )

if (( darwin_major_version == 17 )); then
    setupassistant_did_see_pref_keys+=( 'DidSeeTrueTonePrivacy' ) # Only exists in macOS 10.13, I believe it was a typo and replaced with "DidSeeTrueTone" in macOS 10.14.
elif (( darwin_major_version >= 18 )); then
    setupassistant_did_see_pref_keys+=( 'DidSeeAppearanceSetup' 'DidSeeTrueTone' ) # Added in macOS 10.14.

    if (( darwin_major_version >= 19 )); then
        setupassistant_did_see_pref_keys+=( 'DidSeeActivationLock' 'DidSeeScreenTime' ) # Added in macOS 10.15.

        if (( darwin_major_version >= 20 )); then
            setupassistant_did_see_pref_keys+=( 'DidSeeAccessibility' 'DidSeeAppStore' ) # Added in macOS 11.
        fi
    fi
fi
    user_template_dir="$3/Library/User Template"

if [ ! -d "${user_template_dir}" ] ; then
    user_template_dir="$3/System/Library/User Template"

fi

    for USER_TEMPLATE in "${user_template_dir}"/*
    do
        write_prefs "${USER_TEMPLATE}"
    done