diff --git a/utils/.gitignore b/utils/.gitignore
index f21119ee..a3934a5a 100644
--- a/utils/.gitignore
+++ b/utils/.gitignore
@@ -25,3 +25,4 @@ tail
 type
 mkdir
 rmdir
+which
diff --git a/utils/Makefile b/utils/Makefile
index e9e6d5d1..4dec77da 100644
--- a/utils/Makefile
+++ b/utils/Makefile
@@ -41,6 +41,7 @@ tail \
 type \
 mkdir \
 rmdir \
+which \
 
 INSTALLBINARIES:=$(addprefix $(DESTDIR)$(BINDIR)/,$(BINARIES))
 
diff --git a/utils/which.cpp b/utils/which.cpp
new file mode 100755
index 00000000..e9020300
--- /dev/null
+++ b/utils/which.cpp
@@ -0,0 +1,169 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2012.
+
+    This program is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    This program is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+    more details.
+
+    You should have received a copy of the GNU General Public License along with
+    this program. If not, see <http://www.gnu.org/licenses/>.
+
+    which.cpp
+    Locate a program in the PATH.
+
+*******************************************************************************/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <error.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#if !defined(VERSIONSTR)
+#define VERSIONSTR "unknown version"
+#endif
+
+bool Which(const char* cmd, const char* path, bool all)
+{
+	if ( strchr(cmd, '/') )
+	{
+		struct stat st;
+		if ( stat(path, &st) )
+		{
+			printf("%s\n", cmd);
+			return true;
+		}
+		return false;
+	}
+
+	// Sortix doesn't support that the empty string means current directory.
+	bool found = false;
+	char* dirname = NULL;
+	while ( *path )
+	{
+		if ( dirname ) { free(dirname); dirname = NULL; }
+		size_t len = strcspn(path, ":");
+		if ( !len ) { path++; continue; }
+		dirname = (char*) malloc((len+1) * sizeof(char));
+		if ( !dirname )
+			error(1, errno, "malloc");
+		memcpy(dirname, path, len * sizeof(char));
+		dirname[len] = '\0';
+		path += len + 1;
+		int dirfd = open(dirname, O_RDONLY | O_DIRECTORY);
+		if ( dirfd < 0 )
+		{
+			if ( errno == EACCES )
+				error(1, errno, "%s", dirname);
+			// TODO: May be a security concern to continue;
+			if ( errno == ENOENT )
+				continue;
+			continue;
+		}
+		struct stat st;
+		int ret = fstatat(dirfd, cmd, &st, 0);
+		if ( ret != 0 )
+			continue;
+		printf("%s/%s\n", dirname, cmd);
+		found = true;
+		if ( !all )
+			break;
+	}
+	free(dirname);
+	return found;
+}
+
+void Usage(FILE* fp, const char* argv0)
+{
+	fprintf(fp, "Usage: %s [-a] FILENAME...\n", argv0);
+	fprintf(fp, "Locate a program in the PATH.\n");
+}
+
+void Help(FILE* fp, const char* argv0)
+{
+	Usage(fp, argv0);
+}
+
+void Version(FILE* fp, const char* argv0)
+{
+	fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
+	fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
+	fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
+	fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
+}
+
+int main(int argc, char* argv[])
+{
+	const char* argv0 = argv[0];
+	bool all = false;
+	for ( int i = 1; i < argc; i++ )
+	{
+		const char* arg = argv[i];
+		if ( arg[0] != '-' )
+			continue;
+		argv[i] = NULL;
+		if ( !strcmp(arg, "--") )
+			break;
+		if ( arg[1] != '-' )
+			for ( size_t i = 1; arg[i]; i++ )
+				switch ( arg[i] )
+				{
+				case 'a': all = true; break;
+				default:
+					fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, arg[i]);
+					Usage(stderr, argv0);
+					exit(1);
+				}
+		else if ( !strcmp(arg, "--help") ) { Help(stdout, argv0); exit(0); }
+		else if ( !strcmp(arg, "--usage") ) { Usage(stdout, argv0); exit(0); }
+		else if ( !strcmp(arg, "--version") ) { Version(stdout, argv0); exit(0); }
+		else
+		{
+			fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
+			Usage(stderr, argv0);
+			exit(1);
+		}
+	}
+
+	int num_args = 0;
+	for ( int i = 1; i < argc; i++ )
+		if ( argv[i] )
+			num_args++;
+
+	if ( !num_args )
+	{
+		fprintf(stderr, "%s: missing operand\n", argv0);
+		exit(1);
+	}
+
+	const char* path = getenv("PATH");
+	if ( !path )
+	{
+		fprintf(stderr, "%s: PATH variable is not set\n", argv0);
+		exit(1);
+	}
+
+	bool success = true;
+	for ( int i = 1; i < argc; i++ )
+	{
+		const char* arg = argv[i];
+		if ( !arg )
+			continue;
+		if ( !Which(arg, path, all) )
+			success = false;
+	}
+
+	return success ? 0 : 1;
+}