editcap: Document use of stdin and stdout

Editcap accepts '-' for stdin or stdout, document that. Also change
an incorrect statement that claims that the '-v' flag writes to
standard output; it writes to standard error.

1 files changed, 1 insertions, 1 deletions

diff --git a/editcap.c b/editcap.c
index 56f8acf061..f2909e01b6 100644
--- a/editcap.c
+++ b/editcap.c
@@ -736,7 +736,7 @@ print_usage(FILE *output)
     fprintf(output, "\n");
     fprintf(output, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
     fprintf(output, "\n");
-    fprintf(output, "<infile> and <outfile> must both be present.\n");
+    fprintf(output, "<infile> and <outfile> must both be present; use '-' for stdin or stdout.\n");
     fprintf(output, "A single packet or a range of packets can be selected.\n");
     fprintf(output, "\n");
     fprintf(output, "Packet selection:\n");