Grep vs. Ripgrep (rg)

Just as fd was built as a modern Rust alternative to find, ripgrep (rg) was built as a modern alternative to grep.

While GNU grep is incredibly fast, it was not built with modern codebases in mind. If you are searching through a massive Git repository, grep will laboriously search inside .git/ and node_modules/ unless you write complex exclude statements.

The Definitive Comparison

Feature	grep (Traditional POSIX)	ripgrep / rg (Modern Rust)
Primary Audience	Sysadmins, Logs, Scripts	Developers, Source Code
Speed (Single File)	Extremely Fast	Extremely Fast
Speed (Directories)	Fast (Single-threaded)	Blazing (Parallel multi-threading)
Hidden Files	Searched by default	Ignored by default
.gitignore Support	No	Yes (Automatic)
Regex Engine	POSIX / PCRE	Rust Regex (PCRE-like)
Default Output	Monochrome (unless aliased)	Colorized, line numbers, grouped by file
Ubiquity	Pre-installed everywhere	Requires manual installation

When to use ripgrep

You should reach for ripgrep for interactive terminal sessions and developer workflows.

• Searching an entire project codebase for a specific variable name.
• Refactoring code where you want to automatically ignore build/ and dist/ directories.
• When you want beautiful, readable output that clearly groups matches under their respective filenames with highlighted line numbers.

# ripgrep: Automatically ignores .git, node_modules, and colors output
rg "AuthenticationService"

When to use grep

You must stick with grep for system administration, strict auditing, and portable shell scripting.

• Log Analysis: When searching a single 10GB access.log file, multi-threading directory traversals (ripgrep's main advantage) doesn't matter. GNU grep is highly optimized for single-file reading.
• Piping Output: When you are piping data between commands (cat file.json | jq | grep ...), ripgrep offers little advantage over grep, and grep's standard flags are universally understood.
• Shell Scripts: If you write a .sh script that relies on rg, that script will fail on 99% of servers out of the box. grep is guaranteed to exist.
• Full System Sweeps: When auditing /etc or /var, you want to search hidden files. ripgrep's habit of ignoring hidden files makes it dangerous for security audits.

Summary

Use ripgrep for code. Use grep for logs, pipes, and scripts.