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Go CLI Tools and Generate

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go tool, go generate, code generation, formatting helpers, analysis tools, and practical developer automation with the Go CLI.

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## go generate
Run generators
↗#
go generate ./...

# Run go:generate directives in the current module.

Run matching generators
↗#
go generate -run "stringer|mockgen" ./...

# Only run generators whose command matches a regexp.

Print commands while generating
↗#
go generate -x ./...

# Echo each generate command before running it.

## go tool
Run tool help
↗#
go tool cover -help

# Show help for a specific Go tool.

Analyze profiles
↗#
go tool pprof cpu.prof

# Open a CPU or memory profile with pprof.

Inspect execution trace
↗#
go tool trace trace.out

# Open an execution trace for visualization.

Inspect assembler help
↗#
go tool asm -help

# Show available assembler flags.

## Formatting and source transforms
Format file in place
↗#
gofmt -w main.go

# Format a file and write changes.

Preview formatting diff
↗#
gofmt -d .

# Print the file if formatting would change it.

Apply Go source fixes
↗#
go fix ./...

# Update packages using automated code fixers.

## Analysis and inspection
Compile tests only
↗#
go test -run=^$ ./...

# Build tests without running them.

List transitive deps
↗#
go list -deps ./...

# List all packages including dependencies.

Custom package fields
↗#
go list -f "{{.ImportPath}} {{.Dir}}" ./...

# Print custom package metadata fields via template.

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