v0.2.1

Performance

• Lazy ENVIRON loading for 40-60% faster VM creation
  • os.Environ() syscall deferred until first ENVIRON access
  • Most AWK programs don't use ENVIRON, now they pay zero overhead

Benchmark Results

Metric	Before	After	Improvement
VM creation (no ENVIRON)	87μs	38μs	-56%
Memory allocation	63KB	36KB	-43%
Allocations	150	25	-83%

Real-world benchmarks (awkbench 1MB):

• wordcount: -17%
• groupby: -21%
• filter: -25%

Installation

go install github.com/kolkov/uawk/cmd/uawk@v0.2.1

Full Changelog: v0.2.0...v0.2.1

uawk v0.2.1 (2026-01-12T20:08:10Z)

High-performance AWK interpreter for Go!

8/8 benchmarks faster than GoAWK. Powered by coregex (3-3000x faster regex).

Changelog

⚡ Performance

• 43b48d1: perf: Lazy ENVIRON for v0.2.1 (#5) (@kolkov)

---

Installation:

# Using go install (recommended):
go install github.com/kolkov/uawk/cmd/uawk@v0.2.1

# Or download binary for your platform above

Quick Start:

# Print first column:
uawk '{ print $1 }' file.txt

# Sum numbers:
uawk '{ sum += $1 } END { print sum }' numbers.txt

# Filter lines:
uawk '/pattern/ { print }' file.txt

Documentation: https://github.com/kolkov/uawk#readme

Report Issues: https://github.com/kolkov/uawk/issues