Source code for count.cs

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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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namespace RobvanderWoude
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{
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	internal class Count
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	{
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		static readonly string progver = "1.00";

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		static int Main( string[] args )
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		{
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			bool quietmode = false;
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			int count = 0;
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			string filter = string.Empty;
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			SearchOption searchoption = SearchOption.TopDirectoryOnly;

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			if ( args.Contains( "/?" ) )
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			{
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				return ShowHelp( );
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			}
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			foreach ( string arg in args )
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			{
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				if ( arg[0] == '/' )
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				{
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					if ( arg.ToUpper( ) == "/Q" )
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					{
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						if ( quietmode )
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						{
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							return ShowHelp( "Duplicate command line switch /Q" );

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						}
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						quietmode = true;
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					}
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					else if ( arg.ToUpper( ) == "/S" && !Console.IsInputRedirected )

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					{
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						if ( searchoption == SearchOption.AllDirectories )

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						{
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							return ShowHelp( "Duplicate command line switch /S" );

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						}
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						searchoption = SearchOption.AllDirectories;

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					}
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					else
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					{
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						return ShowHelp( "Invalid command line switch {0}", arg );

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					}
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				}
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				else
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				{
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					if ( !string.IsNullOrWhiteSpace( filter ) )

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					{
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						if ( Console.IsInputRedirected )
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						{
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							return ShowHelp( "Duplicate filter specification" );

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						}
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						else
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                        {
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							return ShowHelp( "Duplicate file specification" );

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						}
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					}
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					filter = arg;
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				}
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			}
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			if ( Console.IsInputRedirected )
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			{
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				while ( Console.In.Peek( ) != -1 )
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				{
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					string line = Console.ReadLine( );
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					if ( line.Contains( filter ) )
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					{
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						count++;
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					}
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				}
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			}
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			else
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			{
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				if ( args.Length == 0 )
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				{
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					return ShowHelp( );
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				}
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				try
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				{
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					string dir = Directory.GetParent( filter ).FullName;

					string files = Path.GetFileName( filter );

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					if ( Directory.Exists( filter ) )
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					{
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						dir = Path.GetFullPath( filter );
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						files = "*.*";
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					}
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					count = Directory.GetFiles( dir, files, searchoption ).Length;

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				}
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				catch( Exception e )
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				{
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					return ShowHelp( e.Message );
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				}
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			}
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			if ( !quietmode )
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			{
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				Console.WriteLine( count );
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			}
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			return count;
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		}
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		public static int ShowHelp( params string[] errmsg )

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		{
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			#region Error Message
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			if ( errmsg.Length > 0 )
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			{
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				List<string> errargs = new List<string>( errmsg );

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				errargs.RemoveAt( 0 );
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				Console.Error.WriteLine( );
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				Console.ForegroundColor = ConsoleColor.Red;

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				Console.Error.Write( "ERROR:\t" );
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				Console.ForegroundColor = ConsoleColor.White;

				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );

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				Console.ResetColor( );
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			}
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			#endregion Error Message
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			#region Help Text
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			/*
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			Count.exe,  Version 1.00
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			Count specified objects and return result as errorlevel

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			Usage:    Count.exe  filespec  [ /S ]  [ /Q ]

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			   or:    some_prog  |  Count.exe  [ filter ]  [ /Q ]

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```

			Where:    filespec      specifies files to be counted (default: *.*)

			          some_prog     program whose output is to be counted (all lines)

			          filter        filter for some_prog (count lines containing filter)

			          /Q            Quiet mode: no screen output

			          /S            recursive (include Subdirectories)

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			Examples:
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			=========
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			Count number of *.exe files in C:\Windows\System32 and subdirectories:

			Count.exe C:\Windows\System32\*.exe /S

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			Count number of subdirectories in C:\Windows\System32:

			DIR /AD /B /S C:\Windows\System32 | Count.exe

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			Count number of environment variables:

```
			SET | Count.exe "="
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```

			Notes:    Instead of Count.exe, one could use Windows' native FIND.EXE

			          with its /C switch in a FOR /F loop, but Count.exe may make

			          your batch code easier to read by using SET Count=%ErrorLevel%

			          Count.exe returns the number of (matching) lines, not the

			          number of occurrences of the specified filter string.

			          Count result is displayed on screen and returned as errorlevel;

			          both are limited to 32-bit integer values.

			          Return code (\"ErrorLevel\") equals count result, or -1 for

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			          (command line) errors.
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```
			Written by Rob van der Woude
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			https://www.robvanderwoude.com
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			*/
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			#endregion Help Text
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			#region Display Help Text
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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Count.exe,  Version {0}", progver );

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			Console.Error.WriteLine( "Count specified objects and return result as errorlevel" );

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			Console.Error.WriteLine( );
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			Console.Error.Write( "Usage:    " );
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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "Count.exe  filespec  [ /S ]  [ /Q ]" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.Write( "   or:    " );
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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "some_prog  |  Count.exe  [ filter ]  [ /Q ]" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.Write( "Where:    " );
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			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "filespec" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( "      specifies files to be counted (default: *.*)" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          some_prog" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "     program whose output is to be counted (all lines)" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          filter" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "        filter for some_prog (count lines containing filter)" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          /Q            Q" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "uiet mode: no screen output" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          /S" );

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			Console.ResetColor( );
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			Console.Error.Write( "            recursive (include " );

			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "S" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( "ubdirectories)" );

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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Examples:" );

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			Console.Error.WriteLine( "=========" );

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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Count number of *.exe files in C:\\Windows\\System32 and subdirectories:" );

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			Console.ForegroundColor = ConsoleColor.Green;

			Console.Error.WriteLine( "Count.exe C:\\Windows\\System32\\*.exe /S" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Count number of subdirectories in C:\\Windows\\System32:" );

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			Console.ForegroundColor = ConsoleColor.Green;

			Console.Error.WriteLine( "DIR /AD /B /S C:\\Windows\\System32 | Count.exe" );

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			Console.ResetColor( );
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```
			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Count number of environment variables:" );

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			Console.ForegroundColor = ConsoleColor.Green;

			Console.Error.WriteLine( "SET | Count.exe \"=\"" );

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			Console.ResetColor( );
```
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```
			Console.Error.WriteLine( );
```
```
 
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			Console.Error.WriteLine( "Notes:    Instead of Count.exe, one could use Windows' native FIND.EXE" );

```
 
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			Console.Error.WriteLine( "          with its /C switch in a FOR /F loop, but Count.exe may make" );

```
 
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			Console.Error.Write( "          your batch code easier to read, by using " );

			Console.ForegroundColor = ConsoleColor.Green;

			Console.Error.WriteLine( "SET Count=%ErrorLevel%" );

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			Console.ResetColor( );
```
```
 
```

			Console.Error.WriteLine( "          Count.exe returns the number of (matching) lines, not the" );

```
 
```

			Console.Error.WriteLine( "          number of occurrences of the specified filter string." );

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			Console.Error.WriteLine( "          Count result is displayed on screen and returned as errorlevel;" );

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			Console.Error.WriteLine( "          both are limited to 32-bit integer values." );

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			Console.Error.WriteLine( "          Return code (\"ErrorLevel\") equals count result, or -1 for" );

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			Console.Error.WriteLine( "          (command line) errors." );

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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Written by Rob van der Woude" );

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			Console.Error.WriteLine( "https://www.robvanderwoude.com" );

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			#endregion Display Help Text
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			return -1;
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		}
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	}
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}
```