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From: tomasorti on 22 Apr 2008 10:23
Hi.
I'm trying to do this with sed, but can't get it.
I'm not a sed guru. Can anyone help me?

I have a file with long paths like:

/home/user/dir1/dir2/libXXX.a
/usr/dir1/dir2/libYYY.a
etc...

I wan't to get just the lib stuff like:

libXXX.a
libYYY.a
etc...

How can I do that with sed? Is it the best approach?
Thanks in advance.
Tom

PD: And if I what to get just

libXXX
libYYY
etc...
From: Dave B on 22 Apr 2008 10:32
On Tuesday 22 April 2008 16:23, tomasorti wrote:

> Hi.
> I'm trying to do this with sed, but can't get it.
> I'm not a sed guru. Can anyone help me?
>
> I have a file with long paths like:
>
> /home/user/dir1/dir2/libXXX.a
> /usr/dir1/dir2/libYYY.a
> etc...
>
> I wan't to get just the lib stuff like:
>
> libXXX.a
> libYYY.a
> etc...
>
> How can I do that with sed? Is it the best approach?

Try this:

sed 's%^.*/%%' yourfile

> Thanks in advance.
> Tom
>
> PD: And if I what to get just
>
> libXXX
> libYYY
> etc...

sed 's%^.*/%%;s%\.a$%%' yourfile

or

sed 's%^.*/\([^/]*\)\.a$%\1%' yourfile'

--
D.
From: Dave B on 22 Apr 2008 10:34
On Tuesday 22 April 2008 16:32, Dave B wrote:

> sed 's%^.*/%%' yourfile

Actually, the ^ isn't even necessary due to greedy matching, so it's just

sed 's%.*/%%' yourfile

and

sed 's%.*/%%;s%\.a$%%' yourfile
sed 's%.*/\([^/]*\)\.a$%\1%' yourfile'

--
D.
From: tomasorti on 22 Apr 2008 11:29
Thank you very much, Dave.
I can't find an online sed tutorial about the uses of % in sed.
At least, I can't find it in here:
http://www.grymoire.com/Unix/Sed.html
and it is the first match for "sed tutorial" on Google.
Could you link me one?

On Apr 22, 4:34 pm, Dave B <da...(a)addr.invalid> wrote:
> On Tuesday 22 April 2008 16:32, Dave B wrote:
>
> > sed 's%^.*/%%' yourfile
>
> Actually, the ^ isn't even necessary due to greedy matching, so it's just
>
> sed 's%.*/%%' yourfile
>
> and
>
> sed 's%.*/%%;s%\.a$%%' yourfile
> sed 's%.*/\([^/]*\)\.a$%\1%' yourfile'
>
> --
> D.

From: Dave B on 22 Apr 2008 11:41
On Tuesday 22 April 2008 17:29, tomasorti wrote:

> Thank you very much, Dave.
> I can't find an online sed tutorial about the uses of % in sed.
> At least, I can't find it in here:
> http://www.grymoire.com/Unix/Sed.html
> and it is the first match for "sed tutorial" on Google.
> Could you link me one?

Well, s%...%...% is just like s/.../.../ (you find the latter in all sed
tutorials). Sed takes whatever character it finds after the "s" as the
separator, so you can use any character (I used %).
Usually, a character different than / is used when the patterns involved
contain themselves slashes, to avoid cluttering the expressions with too
many escapes. In your case, compare

sed 's/.*\///' yourfile

with

sed 's%.*/%%' yourfile

Not a big difference here, but suppose you wanted to replace "//a//b//c//d"
with "foo", then you would have to do

sed 's/\/\/a\/\/b\/\/c\/\/d/foo/' yourfile

Changing the separator (for instance ":") results in

sed 's://a//b//c//d:foo:' yourfile

which imho is more readable.

--
D.
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