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Full Discussion: 'for LINE in $(cat file)' breaking at spaces, not just newlines
Top Forums Shell Programming and Scripting 'for LINE in $(cat file)' breaking at spaces, not just newlines Post 302548609 by natedawg1013 on Thursday 18th of August 2011 10:19:04 PM
Old 08-18-2011
Quote:
Originally Posted by Corona688
Here's an awesomely ugly bash mini-xml parser:

Code:
#!/bin/bash

TAG=()
TPOS=0

# Turn <tag> <stuff> into < tag > \n < stuff >
sed 's#># >\n#g;s#<\(/*\)#<\1 #g;' > /tmp/$$
...
...

Wow you're right that looks ugly lol.

@yazu:
there won't be any random escapes or anything in the XML. I will be preprocessing it, so I know what will be in it and I can filter out anything I don't want. Also, this is highly application-specific. I plan on using it on one XML that just keeps being updated with different data.

After all this fuss, I think I should give you guys my point and see if you have better sugestions. I am running a linux home media server. I use pianobar for pandora, will soon be setting up a music player for my local audio and was hoping to use something like this:

*turns out I can't post links yet. Google Search "script listen to iheartradio", it's the top result from the maemo site.*


to stream internet radio. My problems with it are:
*keeps spitting out song info because of "print" in a loop
*no way to change stations on the fly
*has a timeout
*doesn't have simple arguments like:
--scriptname channel <channelname>
--scriptname stop
--scriptname info
etc.

I knew if I could extract the url and song/artist info from the XML, I would be able to easily write a shell script that could accomplish all of this. That turned out to be a much tougher task then expected. If any of you have python experience and can give some suggestions, please let me know. I would be teaching myself python right now, but I'm too busy and as you can see, I am still having trouble with bash.

Edit:

The main thing I want is to know what is going on. Please whoever answers following this, please include comments in code, descriptive variables, or an explanation. Thank you.

and @corona688:
my code looked surprisingly similar to yours once I analyzed what yours did

And yeah, I should have stated this all from the start. I just wanted a little help where I was stuck so I could try to figure the rest out myself, but now I do see how hard it is to work with XMLs in bash. I guess I was going completely in the wrong direction. Besides, with my code the way it was, it worked fine for anything without a space, but it took 30 seconds to parse. That is 3 times as long as the original python script's refresh interval!!!
Last edited by natedawg1013; 08-18-2011 at 11:35 PM..
 

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LEARN ABOUT MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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