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🆔 NAME

id - print real and effective user and group IDs

🚀 Quick Reference

Use Case	Command	Description
🔍 Show current user info	id	Display user ID, group ID, and supplementary groups
👤 Show only user ID	id -u	Print effective user ID number
👥 Show only group ID	id -g	Print effective group ID number
📋 List all group IDs	id -G	Print all group IDs (space‑separated)
🏷️ Show names instead of numbers	id -n	Combined with -u, -g, or -G to get names
🎯 Show real ID instead of effective	id -r	Use with -u, -g, or -G
👤 Get username only	id -un	Print the username of the current user
👥 Get group name only	id -gn	Print the group name of the current user
📋 List all group names	id -Gn	Print all group names (space‑separated)
🔒 Show security context	id -Z	Print SELinux security context (if available)
0️⃣ Use NUL delimiter	id -z	Output entries separated by NUL, useful for scripting
ℹ️ Check another user	id username	Show info for specified user

📖 SYNOPSIS

id [OPTION]... [USER]...

📝 DESCRIPTION

Print user and group information for each specified USER, or (when USER omitted) for the current user.

⚙️ OPTIONS

• -a — 🔄 ignore, for compatibility with other versions
• -Z, --context — 🔒 print only the security context of the process
• -g, --group — 👥 print only the effective group ID
• -G, --groups — 📋 print all group IDs
• -n, --name — 🏷️ print a name instead of a number, for -ugG
• -r, --real — 🎯 print the real ID instead of the effective ID, with -ugG
• -u, --user — 👤 print only the effective user ID
• -z, --zero — 0️⃣ delimit entries with NUL characters, not whitespace; not permitted in default format
• --help — ℹ️ display this help and exit
• --version — 📦 output version information and exit

Without any OPTION, print some useful set of identified information.

👤 AUTHOR

Written by Arnold Robbins and David MacKenzie.

🐛 REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>

©️ COPYRIGHT

Copyright © 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

📚 SEE ALSO

Full documentation <https://www.gnu.org/software/coreutils/id>
or available locally via: info '(coreutils) id invocation'

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GNU coreutils 8.32 January 2026

🆔 NAME 🚀 Quick Reference 📖 SYNOPSIS 📝 DESCRIPTION ⚙️ OPTIONS 👤 AUTHOR 🐛 REPORTING BUGS ©️ COPYRIGHT 📚 SEE ALSO