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Top Forums UNIX for Dummies Questions & Answers fix the if and then error in bash Post 302566604 by Corona688 on Thursday 20th of October 2011 04:39:58 PM
Old 10-20-2011
Look at this line. What do you think it does?
Code:
http_proxy="hostname:3128" wget http://somesite.com/

It temporarily exports the http_proxy environment variable, setting it to hostname:3128, before running wget to retrieve a webpage. wget sees this variable and uses this proxy. Nothing else in the script sees the http_proxy variable change. It's a very handy ability considering how so many programs use environment vars like these.

You can also do
Code:
http_proxy= wget http://sometime.com/

to prevent wget from seeing an http_proxy something else exported globally. A shell which allowed spaces after the = wouldn't ever be able to do this.

You might have heard of an attempt at creating a 'better shell' with a less shell-like syntax, called the C shell. It's one of the worst shells there is because of its poorly chosen syntax which was built on convenience, leaving many inconsistent parts, parsing bugs that are impossible to fix, and many basic features which the syntax didn't leave any way to add.

There really is a reason the shell does a lot of things the way it does.

Last edited by Corona688; 10-20-2011 at 05:47 PM..
 

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HXEXTRACT(1)							  HTML-XML-utils						      HXEXTRACT(1)

NAME
hxextract - extract selected elements from a HTML or XML file SYNOPSIS
hxextract [ -h | -? ] [ -x ] [ -s text ] [ -e text ] [ -b base ] element-or-class [ -c configfile | file-or-URL ] DESCRIPTION
hxextract outputs all elements with a certain name and/or class. Input must be well-formed, since no HTML heuristics are applied. OPTIONS
The following options are supported: -x Use XML format conventions. -s text Insert text at the start of the output. -e text Insert text at the end of the output. -b base URL base -c configfile Read @chapter lines from configfile (lines must be of the form "@chapter filename") and extract elements from each of those files. -h, -? Print command usage. OPERANDS
The following operands are supported: element-or-class The name of an element to extract (e.g., "H2"), or the name of a class preceded by "." (e.g., ".example") or a combination of both (e.g., "H2.example"). file-or-URL A file name or a URL. To read from standard input, use "-". ENVIRONMENT
To use a proxy to retrieve remote files, set the environment variables http_proxy and ftp_proxy. E.g., http_proxy="http://localhost:8080/" BUGS
Remote files (specified with a URL) are currently only supported for HTTP. Password-protected files or files that depend on HTTP "cookies" are not handled. (You can use tools such as curl(1) or wget(1) to retrieve such files.) SEE ALSO
hxselect(1) 6.x 10 Jul 2011 HXEXTRACT(1)
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