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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.
This commit is contained in:
John Thacker 2022-04-07 20:57:08 -04:00
parent 37ccc2b0e5
commit f0f0f05060
2 changed files with 4 additions and 3 deletions
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5
doc/editcap.adoc
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@ -60,7 +60,8 @@ __infile__, optionally converts them in various ways and writes the
resulting packets to the capture __outfile__ (or outfiles).
By default, it reads all packets from the __infile__ and writes them to the
__outfile__ in pcapng file format.
__outfile__ in pcapng file format. Use '-' for __infile__ or __outfile__
to read from standard input or write to standard output, respectively.
The *-A* and *-B* option allow you to limit the time range from which packets
are read from the __infile__.
@ -184,7 +185,7 @@ If a match is found, the current packet is skipped.
The use of the option *-D 0* combined with the *-v* option is useful
in that each packet's Packet number, Len and MD5 Hash will be printed
to standard out. This verbose output (specifically the MD5 hash strings)
to standard error. This verbose output (specifically the MD5 hash strings)
can be useful in scripts to identify duplicate packets across trace
files.

2
editcap.c
View File

@ -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");