Whoami Tool

Print the current effective username. Simple identity query for scripts, session tracking, and access control verification.

Whoami Tool — Current User Identity

Display the current effective username (and optionally uid/gid/group membership). Essential for scripts that need to verify permissions, log user context, or conditionally execute based on identity.

Quick Start

# Show current username
whoami-tool

# Show full identity
whoami-tool --full

Usage

whoami-tool [OPTIONS]

Options:
  --full         Show username, UID, GID, and primary group
  --uid          Show numeric user ID only
  --groups       Show all group memberships
  --json         Output as structured JSON
  --check USER   Exit 0 if current user matches, 1 if not

Examples

# Basic username
whoami-tool

# Full user identity
whoami-tool --full

# Check if running as root (for privilege checks)
whoami-tool --check root && echo "Running as root"

# Show all groups
whoami-tool --groups

# JSON output for logging
whoami-tool --json

# UID for numeric comparisons
whoami-tool --uid

Features

• Quick identity — one command to know who you are
• Full mode — UID, GID, primary group
• Group membership — all groups the user belongs to
• Identity check — conditional execution based on username
• JSON output — structured for logging and automation
• Exit codes — 0 = success, useful for script conditionals