Support '-H' (scripted mode) to 'zpool get'

This functionality is already available in 'zfs get'.  Providing
it for 'zpool get' is useful and good for consistency.

Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes: #2522

cmd/zpool/zpool_main.c

@@ -266,7 +266,7 @@ get_usage(zpool_help_t idx) {
 	case HELP_EVENTS:
 		return (gettext("\tevents [-vHfc]\n"));
 	case HELP_GET:
-		return (gettext("\tget [-p] <\"all\" | property[,...]> "
+		return (gettext("\tget [-pH] <\"all\" | property[,...]> "
 		    "<pool> ...\n"));
 	case HELP_SET:
 		return (gettext("\tset <property=value> <pool> \n"));
@@ -5617,12 +5617,16 @@ zpool_do_get(int argc, char **argv)
 	int c, ret;
 
 	/* check options */
-	while ((c = getopt(argc, argv, "p")) != -1) {
+	while ((c = getopt(argc, argv, "pH")) != -1) {
 		switch (c) {
 		case 'p':
 			cb.cb_literal = B_TRUE;
 			break;
 
+		case 'H':
+			cb.cb_scripted = B_TRUE;
+			break;
+
 		case '?':
 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
 			    optopt);

man/man8/zpool.8

@@ -62,7 +62,7 @@ zpool \- configures ZFS storage pools
 
 .LP
 .nf
-\fBzpool get\fR [\fB-p\fR] "\fIall\fR" | \fIproperty\fR[,...] \fIpool\fR ...
+\fBzpool get\fR [\fB-pH\fR] "\fIall\fR" | \fIproperty\fR[,...] \fIpool\fR ...
 .fi
 
 .LP
@@ -1079,6 +1079,17 @@ See the "Properties" section for more information on the available pool properti
 Display numbers in parseable (exact) values.
 .RE
 
+.sp
+.ne 2
+.mk
+.na
+\fB\fB-H\fR\fR
+.ad
+.RS 6n
+.rt
+Scripted mode. Do not display headers, and separate fields by a single tab instead of arbitrary space.
+.RE
+
 .RE
 
 .sp