usr.bin: osh: Add builtin 'clear' command

- Clear the screen with the "\033[H" ANSI escape sequence
- Add clear command to the builtin command list

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/usr.bin/osh/osh.c b/usr.bin/osh/osh.c
index aaa4502..db8865d 100644
--- a/usr.bin/osh/osh.c
+++ b/usr.bin/osh/osh.c
@@ -56,6 +56,7 @@
     "kfg      - Start up kfgwm\n"     \
     "bell     - Toggle backspace bell\n" \
     "time     - Get the current time\n" \
+    "clear    - Clear the screen\n"     \
     "exit     - Exit the shell"
 
 #define PROMPT "[root::osmora]~ "
@@ -106,6 +107,12 @@ cmd_echo(int argc, char *argv[])
 }
 
 static void
+cmd_clear(int argc, char *argv[])
+{
+    fputs("\033[H", stdout);
+}
+
+static void
 cmd_bell(int argc, char *argv[])
 {
     const char *usage_str = "usage: bell [on/off]";
@@ -243,6 +250,7 @@ struct builtin_cmd cmds[] = {
     {"reboot",cmd_reboot},
     {"shutdown", cmd_shutdown},
     {"bell", cmd_bell},
+    {"clear", cmd_clear},
     {NULL, NULL}
 };