Another easy one. One of the context lines will have to be updated in Makefile
to apply after the link(1) patch.
>From 99c822c371c0e51464b9093a66dd5c73e3fae8e2 Mon Sep 17 00:00:00 2001
From: Brandon Mulcahy <bran...@jangler.info>
Date: Thu, 16 Oct 2014 17:15:16 -0400
Subject: [PATCH] Add logname(1)
---
Makefile | 1 +
logname.1 | 8 ++++++++
logname.c | 20 ++++++++++++++++++++
3 files changed, 29 insertions(+)
create mode 100644 logname.1
create mode 100644 logname.c
diff --git a/Makefile b/Makefile
index 6f995be..2f0ba53 100644
--- a/Makefile
+++ b/Makefile
@@ -57,6 +57,7 @@ SRC = \
head.c \
hostname.c \
kill.c \
+ logname.c \
ln.c \
ls.c \
md5sum.c \
diff --git a/logname.1 b/logname.1
new file mode 100644
index 0000000..0eebacf
--- /dev/null
+++ b/logname.1
@@ -0,0 +1,8 @@
+.TH LOGNAME 1 sbase\-VERSION
+.SH NAME
+logname \- return the user's login name
+.SH SYNOPSIS
+.B logname
+.SH DESCRIPTION
+.B logname
+prints the login name of the current user.
diff --git a/logname.c b/logname.c
new file mode 100644
index 0000000..aa6357f
--- /dev/null
+++ b/logname.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <unistd.h>
+#include "util.h"
+
+int
+main(int argc, char *argv[])
+{
+ char *login;
+
+ if (argc != 1)
+ eprintf("usage: %s\n", argv[0]);
+
+ if ((login = getlogin()))
+ printf("%s\n", login);
+ else
+ /* perror would say "No such file or directory" */
+ eprintf("%s: no login name\n", argv[0]);
+
+ return 0;
+}
--
2.1.2
