From db0ea785f0231be4315aa4c5af37e64841ce48f2 Mon Sep 17 00:00:00 2001
From: sin <sin@2f30.org>
Date: Wed, 11 Jun 2014 15:42:33 +0100
Subject: [PATCH] Implement -g and -u for id(1)

---
 id.1 | 8 +++++++-
 id.c | 8 +++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/id.1 b/id.1
index 9dca2d3..cd83326 100644
--- a/id.1
+++ b/id.1
@@ -2,13 +2,19 @@
 .SH NAME
 \fBid\fR - Print real and effective user and group IDs
 .SH SYNOPSIS
-\fBid\fR [\fB-G\fR] \fR[\fIuser\fR|\fIuid\fR]
+\fBid\fR [\fB-g\fR] [\fB-u\fR] [\fB-G\fR] \fR[\fIuser\fR|\fIuid\fR]
 .SH DESCRIPTION
 \fBid\fR prints user and group information of the calling process to standard output.
 If a login name or uid is specified, the user and group information of that
 user is displayed.
 .SH OPTIONS
 .TP
+\fB-g\fR
+Print only the effective group ID.
+.TP
+\fB-u\fR
+Print only the effective user ID.
+.TP
 \fB-G\fR
 Display group information as whitespace separated numbers, in no particular order.
 .SH SEE ALSO
diff --git a/id.c b/id.c
index 225c254..1efadbc 100644
--- a/id.c
+++ b/id.c
@@ -18,7 +18,7 @@ static void usernam(const char *nam);
 static void
 usage(void)
 {
-	eprintf("usage: %s [-G] [user | uid]\n", argv0);
+	eprintf("usage: %s [-g] [-u] [-G] [user | uid]\n", argv0);
 }
 
 static int Gflag = 0;
@@ -27,6 +27,12 @@ int
 main(int argc, char *argv[])
 {
 	ARGBEGIN {
+	case 'g':
+		printf("%d\n", getegid());
+		return EXIT_SUCCESS;
+	case 'u':
+		printf("%d\n", geteuid());
+		return EXIT_SUCCESS;
 	case 'G':
 		Gflag = 1;
 		break;