Bash: How to extract an executable from within?
Daniel B. Thurman
dant at cdkkt.com
Tue Sep 15 00:48:37 UTC 2009
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.
I am looking for an alternative.
I tried to wrap the executable with a function such as:
outname=selfextractExe.$$
function unWrapExe() {
cat <<'EOF'
<executable>
EOF
}
# 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?
Thanks!
Dan
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