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-   -   [Linux bash] Why is this not working? (https://talk.maemo.org/showthread.php?t=47136)

rcull 2010-03-11 19:23
Re: [Linux bash] Why is this not working?
 
try

Code:
if /sbin/ifconfig usb0 > /dev/null 2>&1
then
    echo Running
else
    echo Not Running
fi
Rick

lma 2010-03-11 20:03
Re: [Linux bash] Why is this not working?
 
Quote:
Originally Posted by eitama (Post 563990)
The thing that is not working is the * (asterisks).
Try a pattern matching expression, like this:
Code:
if [ "${my#*bc}" != "$my" ]

gobuki 2010-03-11 20:22
Re: [Linux bash] Why is this not working?
 
Quote:
Originally Posted by lma (Post 564241)
Try a pattern matching expression, like this:
Code:
if [ "${my#*bc}" != "$my" ]
Just to mention it: this is a bash feature and not supported by standard shells/busybox.
You should really install a shell with better scripting support if you need regex and follow the countless shell-scripting tutorials on the net - unless maybe you want to deploy it elsewhere. Just make sure you're reading a tutorial for the right shell, since shell scripting != shell scripting.

lma 2010-03-12 05:38
Re: [Linux bash] Why is this not working?
 
Quote:
Originally Posted by gobuki (Post 564266)
Just to mention it: this is a bash feature and not supported by standard shells/busybox.
Wrong, try it!

gobuki 2010-03-12 12:32
Re: [Linux bash] Why is this not working?
 
You are right! I tried it and it works. I'm sorry. But I wonder where this is documented. I had a look at busybox.net and couldn't find anything about scripting or regular expressions. Not even in the manual page: http://busybox.net/downloads/BusyBox.html

Care to give a keyword or link?

SubCore 2010-03-12 13:39
Re: [Linux bash] Why is this not working?
 
the shell built into busybox is the "Almquist shell" (or, more precisely, the debian ash variant.)

your best bet for documentation would probably be this, that's the posix documentation for -compatible shells.

CowboyFromHell 2010-03-13 01:14
Re: [Linux bash] Why is this not working?
 
If you run linux on your PC and ash is installed:
> man ash
contains all of it. Unfortunately man and manpages are not preinstalled on N900 :°(


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