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, 1 insertions, 0 deletions

diff --git a/sh.h b/sh.h
index 222b77c..6cd656d 100644
--- a/sh.h
+++ b/sh.h
@@ -186,6 +186,7 @@ EXTERN	uid_t	ksheuid;	/* effective uid of shell */
 EXTERN	int	exstat;		/* exit status */
 EXTERN	int	subst_exstat;	/* exit status of last $(..)/`..` */
 EXTERN	const char *safe_prompt; /* safe prompt if PS1 substitution fails */
+EXTERN	int	writefd;	/* open file descriptor to -w file */
 
 /*
  * Area-based allocation built on malloc/free