🕒 gnutime

A lightweight Windows 64-bit port of the GNU time utility — built using Visual Studio x64 Native Build Tools. This version replicates core time features such as real, user, and sys timing for any command-line process, and adds support for GNU-style formatting (-f) and output redirection (-o).

❗This is not /usr/bin/time, but a compatible reimplementation targeted at native Windows users — no WSL, MSYS2, or Cygwin required.

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✨ Features

• ✅ Native Windows 64-bit executable (no dependencies)
• ✅ Launches external programs and reports:
  • real: wall clock time
  • user: CPU time in user mode
  • sys: CPU time in kernel mode
• ✅ GNU-compatible formatting via -f (supports %e, %U, %S)
• ✅ Output redirection via -o filename
• ✅ Forwards child process exit code

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📦 Compilation Instructions (Visual Studio)

You must have Microsoft Visual Studio Build Tools (2019 or 2022) installed.

🔧 1. Open the x64 Developer Command Prompt

Search and launch:

x64 Native Tools Command Prompt for VS 2022

📂 2. Clone this repository

git clone https://github.com/ivosetyadi/gnutime.git
cd gnutime

🛠 3. Compile using cl.exe:

cl /O2 /Fe:gtime.exe gtime.c

This will produce gtime.exe — a standalone, portable binary.

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▶️ Usage Examples

gtime ping 127.0.0.1 -n 3

gtime -f "elapsed=%e user=%U sys=%S" ping 127.0.0.1 -n 2

gtime -o time_result.txt -f "real=%e" myscript.bat

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📄 Format Codes (Partial Support)

Code	Meaning
%e	Elapsed real time (wall clock)
%U	User CPU time
%S	System CPU time
%%	Literal %

Note: Memory/I/O stats like -v are not yet supported. Coming soon.

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❗Limitations

• No -v or memory usage support (yet)
• No support for complex nested shell commands (e.g., pipes or sh -c)
• Only available on Windows (compiled for 64-bit targets)

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📌 License

This implementation is provided under the MIT License.
It is not a direct fork of GNU time, but inspired by its functionality.