commit 8b7978b114e5df89218daa9b4b48cc0e918ba917
Author: Sourabh Jain <sourabhjain@linux.ibm.com>
Date:   Mon Feb 4 16:15:14 2019 +0530

    lparstat: introduce the help command line option to print lparstat usage
    
    This patch adds a function to print the usage of lparstat. Also,
    a new element is added to structure option to handle long command
    line argument for help.
    
    Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
    Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>

diff --git a/man/lparstat.8 b/man/lparstat.8
index 9721580..467f570 100644
--- a/man/lparstat.8
+++ b/man/lparstat.8
@@ -9,8 +9,9 @@
 .SH NAME
 lparstat \- Reports logical partition ( LPAR ) related information and statistics.
 .SH SYNOPSIS
-.B /usr/sbin/lparstat
-[ -i ] [ interval [ count ] ]
+.B /usr/sbin/lparstat [ options ]
+.HP
+.B /usr/sbin/lparstat <interval> [ count ]
 .SH DESCRIPTION
 The \fIlparstat\fR command provides a report of LPAR related information and utilization statistics. This command provides a display of current LPAR related parameters and Hypervisor information, as well as utilization statistics for the LPAR.
 
@@ -202,6 +203,17 @@ Desired Variable Capacity Weight
 The variable memory capacity weight of the LPAR. 
 .TP
 .SH
+.TP
+\fB\-h, --help\fR
+Display the usage of lparstat.
+.RS
+.SH
+.TP
+\fB\-V, --version\fR
+Display the lparstat version information.
+.RS
+.SH
+.TP
 interval
 The
 .B interval
diff --git a/src/lparstat.c b/src/lparstat.c
index c9b86fd..1abe54d 100644
--- a/src/lparstat.c
+++ b/src/lparstat.c
@@ -655,8 +655,20 @@ void print_default_output(int interval, int count)
 	} while (--count > 0);
 }
 
+static void usage(void)
+{
+	printf("Usage:  lparstat [ options ]\n\tlparstat <interval> [ count ]\n\n"
+	       "options:\n"
+	       "\t-h, --help		Show this message and exit.\n"
+	       "\t-V, --version	\tDisplay lparstat version information.\n"
+	       "\t-i			Lists details on the LPAR configuration.\n"
+	       "interval		The interval parameter specifies the amount of time between each report.\n"
+	       "count			The count parameter specifies how many reports will be displayed.\n");
+}
+
 static struct option long_opts[] = {
 	{"version",	no_argument,	NULL,	'V'},
+	{"help",	no_argument,	NULL,	'h'},
 	{0, 0, 0, 0},
 };
 
@@ -672,7 +684,7 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
-	while ((c = getopt_long(argc, argv, "iV",
+	while ((c = getopt_long(argc, argv, "iVh",
 				long_opts, &opt_index)) != -1) {
 		switch(c) {
 			case 'i':
@@ -681,7 +693,12 @@ int main(int argc, char *argv[])
 			case 'V':
 				printf("lparstat - %s\n", VERSION);
 				return 0;
+			case 'h':
+				usage();
+				return 0;
 			case '?':
+				usage();
+				return 1;
 			default:
 				break;
 		}