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sort: handle write error in debug mode

--- a/sys/src/cmd/sort.c

+++ b/sys/src/cmd/sort.c

@@ -1430,7 +1430,8 @@

 	k->klen = cl;

 	if(args.vflag) {

-		write(2, l->line, l->llen);

+		if(write(2, l->line, l->llen) != l->llen)

+			exits("write");

 		for(i=0; i<k->klen; i++) {

 			fprint(2, " %.2x", k->key[i]);

 			if(k->key[i] == 0x00 || k->key[i] == 0xff)

-- 

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