Re: change just host of cross compiler

[Daniel Kegel <dkegel at google dot com>]

lazer1 wrote:
> next problem: I dont understand the output of "ln --help",
>
> eg it says: "ln [OPTION]... TARGET [LINK_NAME]" and says 
> LINK_NAME is optional. I dont get that, how can you link something 
> to nothing, surely you need a source + a dest??
>
> for the general situation I am going to have to skip the options,

The help text really is just a quick reference; you need
the real doc.  Try 'man ln'.

> if I do 
>
> cp -r x y
>
> and y already exists and x is a directory it appears to create y/x/...
>
> so I may need to do 
>
> rmdir y
>
> first,

If y has stuff in it, rmdir won't touch it.  You need 'rm -rf y' instead.
However, I don't think they use ln on directories during the install.

> would the following be sufficient for tar.gz decompressions and 
> configure scripts:
>
> #!/bin/sh
>
> rm $2
> rmdir $2
> cp -r $2 $1
>
> or will they sometimes use options?

Again, use the grep!  I just ran 'grep ln' on the log file from a toolchain
build, and it looks like only two forms are used:
  ln -s file1 file2
  ln file1 file2

> is there a trick to access the last 2 arguments,
> thinking of $(argc-2) and $(argc-1), not sure how you would do 
> that in shell-speak, that way I could skip the options without 
> knowing how to,

The man page for sh, or the stadard doc at
http://www.unix.org/single_unix_specification/
but you might be able to get by with

case $1 in
-s) shift;;
*) ;;
esac
cp -f $1 $2

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