question about sed

[troelskn]

Hi

I'm trying to use sed to change the title of my xterm, from the output of mplayer. I have put together the following expression:

echo "ICY Info: StreamTitle='Artist - Song Title';StreamUrl='';" | sed "s/StreamTitle='\([^']*\)/\0\e]0;\1\a/" ;sleep 10

(The echo and sleep stuff is just for testing)

For some reason this doesn't work -- The output is :

ICY Info: StreamTitle='Artist - Song Titlee]0;Artist - Song Title';StreamUrl='';

which makes me think that \e isn't interpreted as an escape-character by sed.

Any ideas?

[Franklin52]

Not sure what you're trying, to extract the artist and the songtitle from the line you can try this:

awk -F "'" '{print $2}'

Regards

[troelskn]

I'm trying to pass everything through untouched, but when I have a match for the song-title, I want additionally print \033[0;SONG_TITLE\007 (Where SONG_TITLE is the song title match). In xterm, this escape-sequence will change the title of the console-window.
I still want the normal output, so everything should pass through untouched -- I just want the escape-sequence in there as an addition to the output.

[drl]

Hi. troelskn.

For the sed short-coming on \e et al, you may want to consider using perl:

      ESCAPE SEQUENCES

       These work as in normal strings.

          \a       Alarm (beep)
          \e       Escape
          \f       Formfeed
          \n       Newline

-- excerpt from man perlreref

cheers, drl

[troelskn]

Thanks, but I wanted to use sed -- mostly as a learning exercise. Now, if this is in fact a limitation of sed -- that it's simply impossible to do -- then I'll use Perl for the task, but I just have a hard time accepting that sed can't do what I want it to.

[troelskn]

I figured it out! Instead of using \e, I tried with \x1B, which generates an escape character. I thought I already tried that, but I had used \x33, which is wrong (33 is the same character in octal).

Thanks for your help none the less

[drl]

Hi.

Good, glad you got it.

Whilst you were doing that, I was looking at info sed, and found:

`\dXXX'
     Produces or matches a character whose decimal ASCII value is XXX.

`\oXXX'
     Produces or matches a character whose octal ASCII value is XXX.

`\xXX'
     Produces or matches a character whose hexadecimal ASCII value is
     XX.

-- excerpt from info sed

I dislike looking at info, but man sed and even O'Reilly sed & awk didn't discuss the character sequences (at least not that I could find) ... cheers, drl