HEAD Man page

LWP-REQUEST(1p) User Contributed Perl Documentation LWP-REQUEST(1p)

NAME

lwp-request, GET, POST, HEAD – Simple command line user agent

SYNOPSIS

lwp-request [-afPuUsSedvhx] [-m method] [-b base URL] [-t timeout] [-i if-modified-since] [-c content-type] [-C credentials] [-p proxy-url] [-o format] url…

DESCRIPTION

This program can be used to send requests to WWW servers and your local
file system. The request content for POST and PUT methods is read from
stdin. The content of the response is printed on stdout. Error
messages are printed on stderr. The program returns a status value
indicating the number of URLs that failed.

The options are:

-m
Set which method to use for the request. If this option is not
used, then the method is derived from the name of the program.

-f Force request through, even if the program believes that the method
is illegal. The server might reject the request eventually.

-b
This URI will be used as the base URI for resolving all relative
URIs given as argument.

-t
Set the timeout value for the requests. The timeout is the amount
of time that the program will wait for a response from the remote
server before it fails. The default unit for the timeout value is
seconds. You might append “m” or “h” to the timeout value to make
it minutes or hours, respectively. The default timeout is ‘3m’,
i.e. 3 minutes.

-i

-c
Set the Content-Type for the request. This option is only allowed
for requests that take a content, i.e. POST and PUT. You can force
methods to take content by using the “-f” option together with
“-c”. The default Content-Type for POST is
“application/x-www-form-urlencoded”. The default Content-type for
the others is “text/plain”.

-p Set the proxy to be used for the requests. The program also loads
proxy settings from the environment. You can disable this with the
“-P” option.

-P Don’t load proxy settings from environment.

-H

Send this HTTP header with each request. You can specify several,
e.g.:

lwp-request \
-H ‘Referer: http://other.url/’ \
-H ‘Host: somehost’ \
http://this.url/

-C : Provide credentials for documents that are protected by Basic
Authentication. If the document is protected and you did not
specify the username and password with this option, then you will
be prompted to provide these values.

The following options controls what is displayed by the program:

-u Print request method and absolute URL as requests are made.

-U Print request headers in addition to request method and absolute
URL.

-s Print response status code. This option is always on for HEAD
requests.

-S Print response status chain. This shows redirect and authorization
requests that are handled by the library.

-e Print response headers. This option is always on for HEAD
requests.

-E Print response status chain with full response headers.

-d Do not print the content of the response.

-o Process HTML content in various ways before printing it. If the
content type of the response is not HTML, then this option has no
effect. The legal format values are; text, ps, links, html and
dump.

If you specify the text format then the HTML will be formatted as
plain latin1 text. If you specify the ps format then it will be
formatted as Postscript.

The links format will output all links found in the HTML document.
Relative links will be expanded to absolute ones.

The html format will reformat the HTML code and the dump format
will just dump the HTML syntax tree.

Note that the “HTML-Tree” distribution needs to be installed for
this option to work. In addition the “HTML-Format” distribution
needs to be installed for -o text or -o ps to work.

-v Print the version number of the program and quit.

-h Print usage message and quit.

-a Set text(ascii) mode for content input and output. If this option
is not used, content input and output is done in binary mode.

Because this program is implemented using the LWP library, it will only
support the protocols that LWP supports.

SEE ALSO

lwp-mirror, LWP

COPRYRIGHT

Copyright 1995-1999 Gisle Aas.

This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

AUTHOR

Gisle Aas

perl v5.20.2 2015-12-05 LWP-REQUEST(1p)

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head Man page

HEAD User Commands HEAD

NAME

head – output the first part of files

SYNOPSIS

head [OPTION]… [FILE]…

DESCRIPTION

Print the first 10 lines of each FILE to standard output. With more
than one FILE, precede each with a header giving the file name.

With no FILE, or when FILE is -, read standard input.

Mandatory arguments to long options are mandatory for short options
too.

-c, –bytes=[-]NUM
print the first NUM bytes of each file; with the leading ‘-‘,
print all but the last NUM bytes of each file

-n, –lines=[-]NUM
print the first NUM lines instead of the first 10; with the
leading ‘-‘, print all but the last NUM lines of each file

-q, –quiet, –silent
never print headers giving file names

-v, –verbose
always print headers giving file names

-z, –zero-terminated
line delimiter is NUL, not newline

–help display this help and exit

–version
output version information and exit

NUM may have a multiplier suffix: b 512, kB 1000, K 1024, MB 1000*1000,
M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P,
E, Z, Y.

AUTHOR

Written by David MacKenzie and Jim Meyering.

REPORTING BUGS

GNU coreutils online help:
Report head translation bugs to

COPRYRIGHT

Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU
GPL version 3 or later .
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

tail

Full documentation at:
or available locally via: info ‘(coreutils) head invocation’

GNU coreutils 8.25 February 2016 HEAD

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