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Help with my first Bash script

post #1 of 16
Thread Starter 
I'm working on a fairly ambitious Bash project to turn Ubuntu into psuedo-Gentoo. Basically, with the help of APT, the script will recompile all the installed packages with the users CFLAGS. I haven't worked out how to suppress this when an update is performed (thinking of writing out the packages that have been recompiled, to save recompiling them twice)

Anyway, my Bash knowledge is very limited, but I'm learning (there doesn't seem like much to learn, just a few builtins and syntax). It doesn't help that I'm not near my Linux machine or even a VM. Is the statement below a valid Bash statement, and will it do what I want it to?

Code:
configvar=`cat ./CFLAGS
(where CFLAGS is a text file with the CFLAGS statement on one line)

I can then refer to $configvar when I invoke the build process?

Apologies if this should be in the Coding and Programming forum - mods, please move if it should!
Edited by chemicalfan - 2/22/11 at 3:03am
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post #2 of 16
Its almost a valid statement. You are missing a backtick (`) at the end. But yes otherwise it would be a valid statement, just keep in mind that whatever you are reading in there may be an array and not just a single string. If its an array you are going to have to handle it differently than you would a string.

If it is just a string that's not going to change you could simplify things by just using

configvar="string"
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post #3 of 16
Thread Starter 
Thanks for the reply, it will be a string as it'll just save hard-coding the CFLAGS in the script. It'll just be echoed into the 'configure' part of the build. I'm still a bit confused by your last statement though? I can't see another way of reading the string in from the file without using cat?

I'll keep this thread going as I encounter trouble - I won't have a chance to work on it tonight but hopefully will tomorrow
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post #4 of 16
If the string is constant meaning it doesnt change you can just hard set it in the script. For example if the file CFLAGS contains the word "overclock.net" you can specify it rather than using cat like this:

configvar="overclock.net"

rather than

configvar=`cat CFLAGS`
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post #5 of 16
http://slackware.mirrors.pair.com/sl...4-13.1/source/

you should check out the .SlackBuild files, they are essentially what you are wanting too, or trying to create here (they will need to be of course modified for ubuntu.)

check out the /kde section, i use these scripts as a template when building kde for ubuntu, over the kubuntu packages, i would use the kde build script (provided by kde dev's), but it annoys me to no end...
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post #6 of 16
Thread Starter 
Quote:
Originally Posted by kc-tr View Post
If the string is constant meaning it doesnt change you can just hard set it in the script. For example if the file CFLAGS contains the word "overclock.net" you can specify it rather than using cat like this:

configvar="overclock.net"

rather than

configvar=`cat CFLAGS`
Ah, I get you now - I want to keep this customisable and seperate. The programmer in me wants to keep as much determined at run-time as possible

Transhour: Thanks for that, I'll check them out. I've found a few good snippets of code on the net, and I think I can just stitch them together. But I'll check out the Slackbuilds, might save me some time and headaches lol
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post #7 of 16
who's your avatar of chemical? is the chick off of pushing daisies, sorry don't know the actress's name, but she played the undead gf, chuck?
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post #8 of 16
Thread Starter 
Quote:
Originally Posted by transhour View Post
who's your avatar of chemical? is the chick off of pushing daisies, sorry don't know the actress's name, but she played the undead gf, chuck?
Not sure, as far as I'm aware she's just an amateur...

On-topic: I'm starting the coding now, but have no test platform as I'm at work (stuck on a stupid XP machine, grr). This will be next to impossible as I'm not sure how APT handles being iterated over. It's looking more like pseudo-code at the moment!
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post #9 of 16
Quote:
Originally Posted by chemicalfan View Post
Not sure, as far as I'm aware she's just an amateur...

On-topic: I'm starting the coding now, but have no test platform as I'm at work (stuck on a stupid XP machine, grr). This will be next to impossible as I'm not sure how APT handles being iterated over. It's looking more like pseudo-code at the moment!
off-topic:

ah okay, she reminded me of the chick off of pushing daisies.

on-topic:

you can write bash-script anywhere, i know a guy who does it in an actual college-rule or legal notepad while he is at work on breaks or slow periods, and then goes home and types it up in vi.

what you mean "how APT handles being iterated over"?

do you mean how to skip out put logs and confirmations?

just pass the quite and yes switches:

apt-get -qy source <packagename>
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post #10 of 16
Thread Starter 
I'm in Notepad++ as the moment (simply because it's a little prettier than standard Notepad ), it's just I can't test it for syntax errors and unexpected behaviour.

At the moment, I'm calling apt-show-versions (to return installed package information) in a for loop, and hoping to deal with each line at a time. I might switch this for an apt-cache call, as I think I can use that with an if statement to determine whether the version is current or not (in conjuction with a command line switch to specify whether the entire system should be recompiled, or only new packages)

The irony is, I'd have perfect confidence coding this in Python, it's just my lack of Bash knowledge that hindering me. Still, life is a learning experience
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