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diff --git a/usr.bin/truss/main.c b/usr.bin/truss/main.c
--- a/usr.bin/truss/main.c
+++ b/usr.bin/truss/main.c
@@ -144,6 +144,12 @@
*/
if ((trussinfo->outfile = fopen(fname, "we")) == NULL)
err(1, "cannot open %s", fname);
+
+ /*
+ * Be friendly to someone who is reading output via "tail -f" or
+ * similar.
+ */
+ (void)setvbuf(trussinfo->outfile, NULL, _IOLBF, 0);
}
/*

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