scripts

[Baruch Siach]

Hi Marc,

On Tue, Mar 01, 2011 at 03:11:31PM +0100, Marc Kleine-Budde wrote:
> On 03/01/2011 03:06 PM, Vanalme Filip wrote:
> [...]
> 
> > One more question about barebox scripts (I guess even scripts in
> > general...). This is part of a script from another board (that I took
> > over for my own board):
> 
> > #!/bin/sh
> > 
> > . /env/config
> > 
> > If [ x$1 = xflash ]; then
> > 	root=flash
> > 	kernel=flash
> > fi
> > 
> > if [ x$1 = xnet ]; then
> > 	root=net
> > 	kernel=net
> > fi
> > 
> > why the scripts are using i.e. [ x$1 = xflash ] instead of just simply [ $1 = flash ] ? Both are doing the same, no ?
> 
> The shell is quite old and doesn't support that. But you're right for
> modern shells like bash or dash.

I get this under bash:

$ [ $UNDEF = test ]
bash: [: =: unary operator expected

However '[ "$UNDEF" = test ]' behaves as expected under bash (but not under 
hush, which is the shell of Barebox).

baruch

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