From c4e80884b5c8ee0e2fbabaa867586d29e1ace9ef Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Tue, 27 Dec 2016 18:00:02 +1300
Subject: Add max(1df) and min(1df)

---
 .gitignore       |  2 ++
 Makefile         | 10 +++++++---
 README.markdown  |  4 +++-
 bin/max.awk      | 10 ++++++++++
 bin/min.awk      | 10 ++++++++++
 man/man1/max.1df | 19 +++++++++++++++++++
 man/man1/min.1df | 19 +++++++++++++++++++
 7 files changed, 70 insertions(+), 4 deletions(-)
 create mode 100644 bin/max.awk
 create mode 100644 bin/min.awk
 create mode 100644 man/man1/max.1df
 create mode 100644 man/man1/min.1df

diff --git a/.gitignore b/.gitignore
index d7a435fa..110f8c4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,9 +2,11 @@ bin/csmw
 bin/ddup
 bin/gwp
 bin/han
+bin/max
 bin/mean
 bin/med
 bin/mftl
+bin/min
 bin/mode
 bin/rfct
 bin/rndi
diff --git a/Makefile b/Makefile
index 97fec6e5..da6b043a 100644
--- a/Makefile
+++ b/Makefile
@@ -71,9 +71,11 @@ all : bin/csmw \
 	bin/ddup \
 	bin/gwp \
 	bin/han \
+	bin/max \
 	bin/mean \
 	bin/med \
 	bin/mftl \
+	bin/min \
 	bin/mode \
 	bin/rfct \
 	bin/rndi \
@@ -93,9 +95,11 @@ clean distclean :
 		bin/ddup \
 		bin/gwp \
 		bin/han \
+		bin/max \
 		bin/mean \
 		bin/med \
 		bin/mftl \
+		bin/min \
 		bin/mode \
 		bin/rfct \
 		bin/rndi \
@@ -193,9 +197,9 @@ install-bash-completion : install-bash
 	install -pm 0644 -- bash/bash_completion "$(HOME)"/.config/bash_completion
 	install -pm 0644 -- bash/bash_completion.d/* "$(HOME)"/.bash_completion.d
 
-install-bin : bin/csmw bin/ddup bin/gwp bin/han bin/mean bin/med bin/mftl \
-	bin/mode bin/rfct bin/rndi bin/sd2u bin/sec bin/slsf bin/su2d bin/tot \
-	bin/unf bin/uts install-bin-man
+install-bin : bin/csmw bin/ddup bin/gwp bin/han bin/max bin/mean bin/med \
+	bin/mftl bin/min bin/mode bin/rfct bin/rndi bin/sd2u bin/sec bin/slsf \
+	bin/su2d bin/tot bin/unf bin/uts install-bin-man
 	install -m 0755 -d -- "$(HOME)"/.local/bin
 	for name in bin/* ; do \
 		[ -x "$$name" ] || continue ; \
diff --git a/README.markdown b/README.markdown
index 109af073..777d5dd1 100644
--- a/README.markdown
+++ b/README.markdown
@@ -394,9 +394,11 @@ Installed by the `install-bin` target:
     *   `unf(1df)` joins lines with leading spaces to the previous line.
         Intended for unfolding HTTP headers, but it should work for most RFC
         822 formats.
-*   Four simple aggregators for numbers:
+*   Six simple aggregators for numbers:
+    *   `max(1df)` prints the maximum.
     *   `mean(1df)` prints the mean.
     *   `med(1df)` prints the median.
+    *   `min(1df)` prints the minimum.
     *   `mode(1df)` prints the first encountered mode.
     *   `tot(1df)` totals the set.
 *   `ap(1df)` reads arguments for a given command from the standard input,
diff --git a/bin/max.awk b/bin/max.awk
new file mode 100644
index 00000000..11d4efd9
--- /dev/null
+++ b/bin/max.awk
@@ -0,0 +1,10 @@
+# Get the maximum of a list of numbers
+{
+    if (NR == 1 || $1 > max)
+        max = $1
+}
+END {
+    if (!NR)
+        exit(1)
+    print max
+}
diff --git a/bin/min.awk b/bin/min.awk
new file mode 100644
index 00000000..c58a3a8f
--- /dev/null
+++ b/bin/min.awk
@@ -0,0 +1,10 @@
+# Get the minimum of a list of numbers
+{
+    if (NR == 1 || $1 < min)
+        min = $1
+}
+END {
+    if (!NR)
+        exit(1)
+    print min
+}
diff --git a/man/man1/max.1df b/man/man1/max.1df
new file mode 100644
index 00000000..28431da4
--- /dev/null
+++ b/man/man1/max.1df
@@ -0,0 +1,19 @@
+.TH MAX 1df "September 2016" "Manual page for max"
+.SH NAME
+.B max
+\- print the maximum of a list of numbers
+.SH SYNOPSIS
+printf '%u\\n' 3 55 17 |
+.B max
+.br
+.B max
+file
+.br
+.B max
+file1 file2
+.SH DESCRIPTION
+.B max
+collects all the newline-delimited numbers given as input, and prints the
+maximum.
+.SH AUTHOR
+Tom Ryder <tom@sanctum.geek.nz>
diff --git a/man/man1/min.1df b/man/man1/min.1df
new file mode 100644
index 00000000..e3279d3b
--- /dev/null
+++ b/man/man1/min.1df
@@ -0,0 +1,19 @@
+.TH MIN 1df "September 2016" "Manual page for min"
+.SH NAME
+.B min
+\- print the minimum of a list of numbers
+.SH SYNOPSIS
+printf '%u\\n' 182 2 22 |
+.B min
+.br
+.B min
+file
+.br
+.B min
+file1 file2
+.SH DESCRIPTION
+.B min
+collects all the newline-delimited numbers given as input, and prints the
+minimum.
+.SH AUTHOR
+Tom Ryder <tom@sanctum.geek.nz>
-- 
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