replaced:

    "exit status not 0"

with errstr() snarfed from wait().

Notes:
Sun Feb 20 17:20:20 EST 2005 rsc
    Presumably you'd have to edit plan9.c to implement this?
    


Reference: /n/sources/patch/sorry/sam-errstr
Date: Sun Feb 20 08:39:53 CET 2005
Reviewed-by: rsc

--- /sys/src/cmd/sam/sam.h	Sun Feb 20 08:36:38 2005
+++ /sys/src/cmd/sam/sam.h	Sun Feb 20 08:36:37 2005
@@ -323,7 +323,7 @@
 void	trytoquit(void);
 int	undo(int);
 void	update(void);
-int	waitfor(int);
+char	*waitfor(int);
 void	warn(Warn);
 void	warn_s(Warn, char*);
 void	warn_SS(Warn, String*, String*);
--- /sys/src/cmd/sam/shell.c	Sun Feb 20 08:36:41 2005
+++ /sys/src/cmd/sam/shell.c	Sun Feb 20 08:36:40 2005
@@ -14,8 +14,11 @@
 	long l;
 	int m;
 	int pid, fd;
-	int retcode;
 	int pipe1[2], pipe2[2];
+	int retcode;
+	char *retmsg;
+
+	retcode = 0;
 
 	if(s->s[0]==0 && plan9cmd.s[0]==0)
 		error(Enocmd);
@@ -115,10 +118,12 @@
 		bpipeok = 0;
 		closeio((Posn)-1);
 	}
-	retcode = waitfor(pid);
+	retmsg = waitfor(pid);
 	if(type=='|' || type=='<')
-		if(retcode!=0)
-			warn(Wbadstatus);
+		if(retmsg!=nil) {
+			warn_s(Wbadstatus, retmsg);
+			retcode = -1;
+		}
 	if(downloaded)
 		checkerrs();
 	if(!nest)
--- /sys/src/cmd/sam/error.c	Sun Feb 20 08:36:44 2005
+++ /sys/src/cmd/sam/error.c	Sun Feb 20 08:36:44 2005
@@ -63,7 +63,7 @@
 	"null characters elided",
 	"can't run pwd",
 	"last char not newline",
-	"exit status not 0",
+	"exit status not 0",		/* replaced by errstr() */
 };
 
 void
@@ -123,7 +123,7 @@
 void
 warn_s(Warn s, char *a)
 {
-	dprint("?warning: %s `%s'\n", wmsg[s], a);
+	dprint("?warning: `%s'\n", s == Wbadstatus ? a : wmsg[s]);
 }
 
 void