yalue / grep

A version of grep which is compatible with Windows

Cross-platform grep implementation

This project sought to be a cross-platform utility compatible with some basic features of GNU grep. It is written in Go so that it can be easily built for Windows, but at the cost of GNU grep's excellent performance.

It currently supports a few of the short command-line flags from GNU grep, and uses Go's regular expressions.

Compiling / Installation

For simple installation, just run go install github.com/yalue/grep. Alternatively, download links for Windows can be found on the releases page.

Usage

Basic usage: grep [flags] <expression> [file paths]. If no file paths are provided, the program will read from standard input.

The regular expression supports Go's regular expression syntax. The file path accepts wildcards, and will be expanded according to Go's filepath.Glob(). Running the program with the --help argument will display usage information. The following flags are supported, with behavior identical to GNU grep:

• -i: Perform case-insensitive matching.

• -r: Recursively scan files in all directories matching the given filepaths.

• -v: Print the inverse of each match; don't include lines which did match.

• -o: Print only the portion of each line which matched the regular expression. The default behavior is to print the entire matching line.

• -h: Never show filenames for matching lines. This is the default if only one file (or standard input) is being scanned.

• -H: Always show filenames for matching lines. This is the default if more than one file is being scanned.

• -a: Treat binary files as text files. The default behavior will simply print a message if a matching line is found in a binary file. Any file containing a null byte is counted as "binary".