1 files changed, 41 insertions, 0 deletions
diff --git a/usr.bin/learn/src/tee.c b/usr.bin/learn/src/tee.c
new file mode 100644
index 00000000000..6d2a94b44c2
--- /dev/null
+++ b/usr.bin/learn/src/tee.c
@@ -0,0 +1,41 @@
+char *PS1;
+
+main()
+{
+	int f;
+	char c;
+	char *getenv(char *);
+
+	PS1 = getenv("PS1");
+	if (PS1==0)
+		PS1 = "$ ";
+	f = creat(".ocopy", 0666);
+	while (read(0, &c, 1) == 1) {
+		write (1, &c, 1);
+		put(c, f);
+	}
+	fl(f);
+	close(f);
+}
+
+static char ln[5120];
+char *p = ln;
+put(c, f)
+{
+	*p++ = c;
+	if (c == '\n') {
+		fl(f);
+		p=ln;
+	}
+}
+fl(f)
+{
+	register char *s;
+
+	s = ln;
+	while (*s == '$' && *(s+1) == ' ')
+		s += 2;
+	if (strncmp(s, PS1, strlen(PS1)) == 0)
+		s += strlen(PS1);
+	write(f, s, p-s);
+}