1 files changed, 99 insertions, 0 deletions
diff --git a/shell_cmds/printenv/printenv.c b/shell_cmds/printenv/printenv.c
new file mode 100644
index 0000000..315833e
--- /dev/null
+++ b/shell_cmds/printenv/printenv.c
@@ -0,0 +1,99 @@
+/*-
+ * Copyright (c) 1987, 1993
+ *	The Regents of the University of California.  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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1987, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#if 0
+#ifndef lint
+static char sccsid[] = "@(#)printenv.c	8.2 (Berkeley) 5/4/95";
+#endif /* not lint */
+#endif
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+void	usage(void);
+extern char **environ;
+
+/*
+ * printenv
+ *
+ * Bill Joy, UCB
+ * February, 1979
+ */
+int
+main(int argc, char *argv[])
+{
+	char *cp, **ep;
+	size_t len;
+	int ch;
+
+	while ((ch = getopt(argc, argv, "")) != -1)
+		switch(ch) {
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc == 0) {
+		for (ep = environ; *ep; ep++)
+			(void)printf("%s\n", *ep);
+		exit(0);
+	}
+	len = strlen(*argv);
+	for (ep = environ; *ep; ep++)
+		if (!memcmp(*ep, *argv, len)) {
+			cp = *ep + len;
+			if (!*cp || *cp == '=') {
+				(void)printf("%s\n", *cp ? cp + 1 : cp);
+				exit(0);
+			}
+		}
+	exit(1);
+}
+
+void
+usage(void)
+{
+	(void)fprintf(stderr, "usage: printenv [name]\n");
+	exit(1);
+}