Michael O'Keefe wrote:
Gus Wirth wrote:
I have a bunch of lines similar to the following generated from an rpm
spec file using grep:
%{_libdir}/wine/odbc32.dll.so
I want to trim off the front part %{_libdir}/wine/ and the back part
.dll.so leaving only the base name of the file. All the lines have
exactly the same front and back parts so I can do an exact match. I'm
trying to figure out if I can do the removal in one shot or if I need
two passes to do this, but right now about the only thing I know about
sed is that it exists and is used for stuff like this. Trying to use
GNU info pages is a recipe for headaches. Is there a simple reference
for sed anywhere other than the O'Reilly sed & awk book? Or, since
this is a one-off project, can someone give me some hints?
s/^.*\/\(.*\)\.dll\.so$/\1/
GNU sed version 4.1.5
Thanks! That works great. Dissecting this expression, it seems that the
first portion ^.*\/ does a match on everything from the beginning of
the line to the last last /, then the expression in parenthesis (.*)
matches whatever is left except for the end piece which is the
\.dll\.so$ The \1 returns the chunk that is in the parenthesis.
Am I reading that correctly? Turns out my book Mastering Regular
Expressions has the info I need. It was sitting in the other bookcase so
it didn't immediately come to mind.
Gus
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