Re: Bash: How to extract an executable from within?

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On Mon, Sep 14, 2009 at 7:48 PM, Daniel B. Thurman <[email protected]> wrote:
> I noticed that some (older?) shell-scripts have
> self-extracting executables built in and extracting
> was done done by using a tail +N $0 where N is the
> line number where the executable line is located to
> the end of the file. Unfortunately, Fedora's tail program
> does not support the +N option.

tail -n +40 should begin the tail at line 40 for example.

> I am looking for an alternative.
> I tried to wrap the executable with a function such as:
> outname=selfextractExe.$$
> function unWrapExe() {
> cat <<'EOF'
> <executable>
> }
> # Do pre-shell stuff
> unWrapExe > $outname
> ./outname
> # Do post-shell stuff
> The problem as I see it, is somehow cat blows
> up when certain characters appear in the input
> stream and the output executable file becomes
> corrupted cannot be executed.  I have tried
> echo and I cannot think of another program to
> try.
> So, how does one go about fixing these sort of
> problems nowadays?

You might take a look at shar for packing executables in shell scripts.


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