group(5)

👑 group(5) — the user group file, bestie edition

okay so you want the tea on group(5)? it's a section 5 (File Formats Manual) page, and it's literally the manual page for the user group file. it's short, it's iconic, it's giving "small but powerful." let's go 💅

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✨ NAME ✨

group — the user group file. that's it, that's the whole vibe 🎀

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🌸 DESCRIPTION 🌸

the file /etc/group is a text file that defines all the groups on your system. one entry per line, no cap. and every single line has this exact shape:

group_name:password:GID:user_list

now let's break down the fields one by one, because the way this colon-separated situation works is lowkey important 🦋

• group_name — the name of the group. what it says on the tin, honestly.
• password — the (encrypted) group password. and listen: if this field is empty, then no password is needed at all. empty = free entry, periodt.
• GID — the numeric group ID. numbers only, bestie, this is the group's literal ID card 🔥
• user_list — a list of the usernames that are members of this group. and how do we separate them? with commas. commas are the friendship bracelets holding this list together, fr fr.

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📁 FILES 📁

• /etc/group — yes, the whole entire file. that's the file. that's the star of the show ✨

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💀 BUGS 💀

okay so this is the part where even the man page is like "yeah... it's rough."

as the 4.2BSD initgroups(3) man page says: no one seems to keep /etc/group up-to-date.

not me reading that and feeling personally attacked 😭 it's a real problem though — this file gets stale and nobody's maintaining it. keep an eye on it, bestie, okay? 🫶

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🦋 SEE ALSO 🦋

go forth and read these too, they're all part of the same little ecosystem:

• chgrp(1)
• gpasswd(1)
• groups(1)
• login(1)
• newgrp(1)
• sg(1)
• getgrent(3)
• getgrnam(3)
• gshadow(5)
• passwd(5)
• vigr(8)

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💖 and that's the whole page! shoutout to the Linux man-pages 6.20 release, dated 2025-05-17 — the date that blessed this little group(5) page into existence. slay. now go check your /etc/group before it embarrasses you 🙈👑