Cacher is the code snippet organizer for pro developers

Shader "Unlit/Outline"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _OutlineColor("Color", Color) = (1,0,0,1)
        _LineLength ("OutlineLength", Float) = 0.3
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100
  
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv);
                return col;
            }
            ENDCG
        }

        Pass
        {
            Cull front

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float4 normal : NORMAL;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
            };

            fixed4 _OutlineColor;
            float _LineLength;

            v2f vert (appdata v)
            {
                v2f o;
                float4 pos = v.vertex + (v.normal * _LineLength);
                o.vertex = mul(UNITY_MATRIX_MVP, pos);
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                return _OutlineColor;
            }
            ENDCG
        }
    }
}