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Full Discussion: System call oddity
Top Forums Shell Programming and Scripting System call oddity Post 302937690 by beomagi on Saturday 7th of March 2015 10:04:00 PM
Old 03-07-2015
Thanks.
Yeah I got that far, but I'm hoping to be able to dynamically chain multiple greps/seds/awks etc together.

The original intent was to parse webpages - using grep/sed etc is actually simple for this.

Here's the intent - I automate getting stuff - like parsing through comics and getting them for me.

I'm looking for make it more dynamic.

e.g. here's how I'm getting one of my comics:


If I want to define all data for a comic, I specify a url, and filter rules.
rooturl:
http;//www.mangahere.co/manga/kingdom/
Chaps:
grep "a class" | grep kingdom | sed 's@<.*href="@@g' | sed 's@".*>@@g' | sed 's-\ --g'
Page:
grep "option value" | sed 's-^.*value="--g' | sed 's-"\ .*--g'
Image:
grep jpg | grep "render(this)" | sed 's-<img.*src="--g' | sed 's-".*--g'


Chapters (lists pages) - filter:grep "a class" | grep kingdom | sed 's@<.*href="@@g' | sed 's@".*>@@g' | sed 's-\ --g'
Code:
beomagi@Ganymede ~
$ curl -s http://www.mangahere.co/manga/kingdom/ | grep "a class" | grep kingdom | sed 's@<.*href="@@g' | sed 's@".*>@@g' | sed 's-\ --g'
http://www.mangahere.co/manga/kingdom/v37/c423/
http://www.mangahere.co/manga/kingdom/v37/c422/
http://www.mangahere.co/manga/kingdom/v37/c421/
http://www.mangahere.co/manga/kingdom/v37/c420/
http://www.mangahere.co/manga/kingdom/v37/c419/
http://www.mangahere.co/manga/kingdom/v37/c418/
http://www.mangahere.co/manga/kingdom/v37/c417/
http://www.mangahere.co/manga/kingdom/v37/c416/
http://www.mangahere.co/manga/kingdom/v37/c415/
http://www.mangahere.co/manga/kingdom/v37/c414/

Pages (has link to image)- filter:grep "option value" | sed 's-^.*value="--g' | sed 's-"\ .*--g'
Code:
beomagi@Ganymede ~
$ curl -s http://www.mangahere.co/manga/kingdom/v37/c422/ | grep "option value" | sed 's-^.*value="--g' | sed 's-"\ .*--g'
http://www.mangahere.co/manga/kingdom/v37/c422/
http://www.mangahere.co/manga/kingdom/v37/c422/2.html
http://www.mangahere.co/manga/kingdom/v37/c422/3.html
http://www.mangahere.co/manga/kingdom/v37/c422/4.html
http://www.mangahere.co/manga/kingdom/v37/c422/5.html
http://www.mangahere.co/manga/kingdom/v37/c422/6.html
http://www.mangahere.co/manga/kingdom/v37/c422/7.html
http://www.mangahere.co/manga/kingdom/v37/c422/8.html
http://www.mangahere.co/manga/kingdom/v37/c422/9.html

And lastly from here
Image filter:grep jpg | grep "render(this)" | sed 's-<img.*src="--g' | sed 's-".*--g'
Code:
beomagi@Ganymede ~
$ curl -s http://www.mangahere.co/manga/kingdom/v37/c422/4.html | grep jpg | grep "render(this)" | sed 's-<img.*src="--g' | sed 's-".*--g'
        http://z.mhcdn.net/store/manga/8198/37-422.0/compressed/g004.jpg?v=11425389828



So the idea is to create templates for a script to follow through for various comics. So If I want to add comics, I just have to come up with a url to initially follow, and rules to define pages. The grep/sed etc would need to be dynamic. I've done it in other languages, but bash is kinda convenient, and more than anything now it's irking me that I can't figure out why I can't make a system call echoing a variable and piping to grep.
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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