Hi,
Added a barebones version of id(1).
Thanks,
sin
>From 87eb2c4b1cef9dead79d22269d509c0fb3c020a2 Mon Sep 17 00:00:00 2001
From: sin <s...@2f30.org>
Date: Wed, 7 Aug 2013 13:40:21 +0100
Subject: [PATCH] Add initial support for id(1)
---
Makefile | 1 +
id.1 | 8 ++++++++
id.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 79 insertions(+)
create mode 100644 id.1
create mode 100644 id.c
diff --git a/Makefile b/Makefile
index 2e31f33..33c78a0 100644
--- a/Makefile
+++ b/Makefile
@@ -46,6 +46,7 @@ SRC = \
fold.c \
grep.c \
head.c \
+ id.c \
kill.c \
ln.c \
ls.c \
diff --git a/id.1 b/id.1
new file mode 100644
index 0000000..a5678e3
--- /dev/null
+++ b/id.1
@@ -0,0 +1,8 @@
+.TH ID 1 sbase\-VERSION
+.SH NAME
+id \- print real and effective user and group IDs
+.SH DESCRIPTION
+.B id
+Print user and group information for the current user.
+.SH SEE ALSO
+.IR who(1)
diff --git a/id.c b/id.c
new file mode 100644
index 0000000..19248d0
--- /dev/null
+++ b/id.c
@@ -0,0 +1,70 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/types.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <grp.h>
+#include <stdio.h>
+#include <limits.h>
+#include "util.h"
+
+static void
+usage(void)
+{
+ eprintf("usage: %s\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+ struct passwd *pw;
+ struct group *gr;
+ uid_t uid, euid;
+ gid_t gid, egid, groups[NGROUPS_MAX];
+ int ngroups;
+ int i;
+
+ ARGBEGIN {
+ default:
+ usage();
+ } ARGEND;
+
+ /* Print uid/euid info */
+ uid = getuid();
+ printf("uid=%u", uid);
+ if (!(pw = getpwuid(uid)))
+ eprintf("getpwuid:");
+ printf("(%s)", pw->pw_name);
+ if ((euid = geteuid()) != uid) {
+ printf(" euid=%u", euid);
+ if (!(pw = getpwuid(euid)))
+ eprintf("getpwuid:");
+ printf("(%s)", pw->pw_name);
+ }
+
+ /* Print gid/egid info */
+ gid = getgid();
+ printf(" gid=%u", gid);
+ if (!(gr = getgrgid(gid)))
+ eprintf("getgrgid:");
+ printf("(%s)", gr->gr_name);
+ if ((egid = getegid()) != gid) {
+ printf(" egid=%u", egid);
+ if (!(gr = getgrgid(egid)))
+ eprintf("getgrgid:");
+ printf("(%s)", gr->gr_name);
+ }
+
+ /* Print groups */
+ ngroups = getgroups(NGROUPS_MAX, groups);
+ if (ngroups < 0)
+ eprintf("getgroups:");
+ for (i = 0; i < ngroups; i++) {
+ gid = groups[i];
+ printf("%s%u", !i ? " groups=" : ",", gid);
+ if (!(gr = getgrgid(gid)))
+ eprintf("getgrgid:");
+ printf("(%s)", gr->gr_name);
+ }
+ putchar('\n');
+ return 0;
+}
--
1.8.2.3
