numtools

commit 5c71d867b926ca74ab063744b0359086be572e88
parent 29ec796e11dfd5f8810c601efa2f71b694c5b5d3
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Mon,  9 May 2022 16:15:29 +0200

stddev, stdvar: add help option

Diffstat:
M
stddev.1
 | 
3
+++
M
stddev.c
 | 
5
++++-
M
stdvar.1
 | 
3
+++
M
stdvar.c
 | 
5
++++-

4 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/stddev.1 b/stddev.1
@@ -6,6 +6,7 @@
 .Nd returns the standard deviation for each column
 .Sh SYNOPSIS
 .Nm
+.Op Fl h
 .Op Fl u
 .Sh DESCRIPTION
 .Nm
@@ -17,6 +18,8 @@ The output is always in full double precision.
 .Pp
 The options are as follows:
 .Bl -tag -width Ds
+.It Fl h
+Show usage information and exit.
 .It Fl u
 Return the uncorrected sample standard deviation instead.
 .El
diff --git a/stddev.c b/stddev.c
@@ -12,7 +12,7 @@ char *argv0;
 static void
 usage(void)
 {
-	errx(1, "usage: %s [-u]\n", argv0);
+	errx(1, "usage: %s [-h] [-u]\n", argv0);
 }
 
 int
@@ -25,6 +25,9 @@ main(int argc, char *argv[])
 		err(2, "pledge");
 
 	ARGBEGIN {
+	case 'h':
+		usage();
+		break;
 	case 'u':
 		correction = 0;
 		break;
diff --git a/stdvar.1 b/stdvar.1
@@ -6,6 +6,7 @@
 .Nd returns the standard variance for each column
 .Sh SYNOPSIS
 .Nm
+.Op Fl h
 .Op Fl u
 .Sh DESCRIPTION
 .Nm
@@ -17,6 +18,8 @@ The output is always in full double precision.
 .Pp
 The options are as follows:
 .Bl -tag -width Ds
+.It Fl h
+Show usage information and exit.
 .It Fl u
 Return the uncorrected sample standard variance instead.
 .El
diff --git a/stdvar.c b/stdvar.c
@@ -12,7 +12,7 @@ char *argv0;
 static void
 usage(void)
 {
-	errx(1, "usage: %s [-u]\n", argv0);
+	errx(1, "usage: %s [-h] [-u]\n", argv0);
 }
 
 int
@@ -25,6 +25,9 @@ main(int argc, char *argv[])
 		err(2, "pledge");
 
 	ARGBEGIN {
+	case 'h':
+		usage();
+		break;
 	case 'u':
 		correction = 0;
 		break;