07-25-2011
It's common (and POSIX) convention for stdin/stdout:
Utility Conventions
"For utilities that use operands to represent files to be opened for either reading or writing, the '-' operand should be used only to mean standard input (or standard output when it is clear from context that an output file is being specified)."
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HLINS(1) General Commands Manual HLINS(1)
NAME
hlins - insert url's into html documents
SYNOPSIS
hlins [options] [infile]
DESCRIPTION
hlins is a program that inserts hypertext links into html documents, according to one or several data bases associating addresses (url's)
to names. hlins is designed for inserting links for persons: It knows about abbreviations of first and middle names and tolerated dropping
of the last part of a composite last name.
If no file argument is given then input is taken from stdin; when no output option (see below) is given then output goes to stdout.
For a complete description, see the documention in html format.
OPTIONS
hlins follows the usual GNU command line syntax, with long options starting with two dashes (`--').
-o, --output-file file
Write to file instead of standard output
-h, --help
Show a summary of options.
-v, --version
Show the version of the program.
-q, --quiet
Surpress diagnostic output.
-db, --data-bases files ...
Use files ... as data bases
-m, --modify files ...
Dont't act as filter but perform in-pace modifications of files.
-R, --recursive
Recursively descend into directories and act on all files with names ending on .html.
-td, --tmp-dir dir
Use directory dir to create temporary files.
--db-to-html
List the address data bases in HTML format to stdout.
ENVIRONMENT
TMPDIR default directory for creating temporay files.
VERSION
This manual pages describes version 0.39.
SEE ALSO
The full documentation with examples should be available in /usr/share/doc/hlins/.
See also the hlins home page http://www.lsv.ens-cachan.fr/~treinen/hlins/.
AUTHOR
Ralf Treinen <treinen@debian.org>.
July 25, 2000 HLINS(1)