Running minecraft without launcher

minecraft.sh

# minecraft root directory
MC_DIR=~/.minecraft

# Game location
GAME_DIR=$MC_DIR/profile

# Assets location
ASSETS_DIR=$MC_DIR/assets

# Version to use
VERSION=1.14.4

# Native libs location
NATIVES_DIR=path/to/natives

# Player name
PLAYER=Player

# Window properties
WIDTH=800
HEIGHT=640

cd $MC_DIR

java \
    -Xss1M \
    -Djava.library.path=$NATIVES_DIR \
    -Dminecraft.launcher.brand=minecraft-launcher \
    -Dminecraft.launcher.version=2.1.5965 \
    -cp $MC_DIR/libraries/com/mojang/patchy/1.1/patchy-1.1.jar:$MC_DIR/libraries/oshi-project/oshi-core/1.1/oshi-core-1.1.jar:$MC_DIR/libraries/net/java/dev/jna/jna/4.4.0/jna-4.4.0.jar:$MC_DIR/libraries/net/java/dev/jna/platform/3.4.0/platform-3.4.0.jar:$MC_DIR/libraries/com/ibm/icu/icu4j-core-mojang/51.2/icu4j-core-mojang-51.2.jar:$MC_DIR/libraries/com/mojang/javabridge/1.0.22/javabridge-1.0.22.jar:$MC_DIR/libraries/net/sf/jopt-simple/jopt-simple/5.0.3/jopt-simple-5.0.3.jar:$MC_DIR/libraries/io/netty/netty-all/4.1.25.Final/netty-all-4.1.25.Final.jar:$MC_DIR/libraries/com/google/guava/guava/21.0/guava-21.0.jar:$MC_DIR/libraries/org/apache/commons/commons-lang3/3.5/commons-lang3-3.5.jar:$MC_DIR/libraries/commons-io/commons-io/2.5/commons-io-2.5.jar:$MC_DIR/libraries/commons-codec/commons-codec/1.10/commons-codec-1.10.jar:$MC_DIR/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar:$MC_DIR/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar:$MC_DIR/libraries/com/mojang/brigadier/1.0.17/brigadier-1.0.17.jar:$MC_DIR/libraries/com/mojang/datafixerupper/2.0.24/datafixerupper-2.0.24.jar:$MC_DIR/libraries/com/google/code/gson/gson/2.8.0/gson-2.8.0.jar:$MC_DIR/libraries/com/mojang/authlib/1.5.25/authlib-1.5.25.jar:$MC_DIR/libraries/org/apache/commons/commons-compress/1.8.1/commons-compress-1.8.1.jar:$MC_DIR/libraries/org/apache/httpcomponents/httpclient/4.3.3/httpclient-4.3.3.jar:$MC_DIR/libraries/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar:$MC_DIR/libraries/org/apache/httpcomponents/httpcore/4.3.2/httpcore-4.3.2.jar:$MC_DIR/libraries/it/unimi/dsi/fastutil/8.2.1/fastutil-8.2.1.jar:$MC_DIR/libraries/org/apache/logging/log4j/log4j-api/2.8.1/log4j-api-2.8.1.jar:$MC_DIR/libraries/org/apache/logging/log4j/log4j-core/2.8.1/log4j-core-2.8.1.jar:$MC_DIR/libraries/org/lwjgl/lwjgl/3.2.2/lwjgl-3.2.2.jar:$MC_DIR/libraries/org/lwjgl/lwjgl-jemalloc/3.2.2/lwjgl-jemalloc-3.2.2.jar:$MC_DIR/libraries/org/lwjgl/lwjgl-openal/3.2.2/lwjgl-openal-3.2.2.jar:$MC_DIR/libraries/org/lwjgl/lwjgl-opengl/3.2.2/lwjgl-opengl-3.2.2.jar:$MC_DIR/libraries/org/lwjgl/lwjgl-glfw/3.2.2/lwjgl-glfw-3.2.2.jar:$MC_DIR/libraries/org/lwjgl/lwjgl-stb/3.2.2/lwjgl-stb-3.2.2.jar:$MC_DIR/libraries/com/mojang/text2speech/1.11.3/text2speech-1.11.3.jar:$MC_DIR/versions/1.14.4/1.14.4.jar \
    -Xmx2G \
    -XX:+UnlockExperimentalVMOptions \
    -XX:+UseG1GC \
    -XX:G1NewSizePercent=20 \
    -XX:G1ReservePercent=20 \
    -XX:MaxGCPauseMillis=50 \
    -XX:G1HeapRegionSize=32M \
    -Dlog4j.configurationFile=$ASSETS_DIR/log_configs/client-1.12.xml \
    net.minecraft.client.main.Main \
    --username $PLAYER \
    --version $VERSION \
    --gameDir $MC_DIR \
    --assetsDir $ASSETS_DIR \
    --assetIndex 1.14 \
    --accessToken 0

do you know how to do this in offline mode?