Add [-w write-file] optionHEADmaster

ksh will write lines to write-file containing information about
the status of the shell:

 after prompt:          empty line
 after command entry:   "cmd" followed by command
 after cwd change:      "cwd" followed by new cwd

fg is handled specially, printing a new "cmd" line with the original
command associated with the job.

1 files changed, 2 insertions, 0 deletions

diff --git a/path.c b/path.c
index bb18075..70d8a71 100644
--- a/path.c
+++ b/path.c
@@ -198,6 +198,8 @@ set_current_wd(pathx)
 	if (len > current_wd_size)
 		current_wd = aresize(current_wd, current_wd_size = len, APERM);
 	memcpy(current_wd, p, len);
+	if (writefd)
+		dprintf(writefd, "cwd%s\n", p);
 	if (p != pathx && p != null)
 		afree(p, ATEMP);
 }