First version, tested on NetBSD and OS X 10.11.1.

Author: 0-wiz-0

Diff for: .gitignore

@@ -0,0 +1,3 @@
+fn
+*~
+*.tar.gz

Diff for: LICENSE

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+ Copyright (c) 2015 Thomas Klausner
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ 1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
+ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+ 

Diff for: Makefile

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+fn: fn.c
+	$(CC) $(CFLAGS) -o fn fn.c
+clean:
+	rm -f fn
+tar:
+	rm -f fn-0.1
+	ln -fs . fn-0.1
+	tar -cvzf fn-0.1.tar.gz fn-0.1/fn.c fn-0.1/Makefile fn-0.1/LICENSE fn-0.1/README.md
+	rm fn-0.1
+
+.PHONY: clean tar

Diff for: README.md

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+# findnewest
+
+Recursively find newest file in a hierarchy and print its timestamp.
+
+-- Thomas Klausner <[email protected]> 

Diff for: fn.c

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+/*
+ Copyright (c) 2015 Thomas Klausner
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ 1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
+ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+*/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fts.h>
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+time_t
+get_newest(char * const *path) {
+	FTS *dh;
+	FTSENT *entry;
+	time_t newest = 0;
+	dh = fts_open(path, FTS_PHYSICAL, NULL);
+	if (dh == NULL) {
+		return 0;
+	}
+	while ((entry=fts_read(dh)) != NULL) {
+		if ((entry->fts_info != FTS_F) || (entry->fts_statp == NULL)) {
+			continue;
+		}
+		if (entry->fts_statp->st_mtime > newest) {
+			newest = entry->fts_statp->st_mtime;
+		}
+	}
+
+	if (fts_close(dh) != 0) {
+		return 0;
+	}
+
+	return newest;
+}
+
+
+int
+main(int argc, char * const *argv)
+{
+	time_t newest = 0;
+
+	if (argc < 2 || (newest=get_newest(argv+1)) == 0) {
+		fprintf(stderr, "no files found\n");
+		exit(1);
+	}
+
+	printf("%lld\n", (long long)newest);
+	exit(0);
+}