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Use sed to append text to filenames if text not already present

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# 1  
Old 11-13-2012
Use sed to append text to filenames if text not already present
I have some html with hrefs that contain local links to pdf filenames. These filenames should have standardised names, i.e. there should be a label prior to the ".pdf" filename suffix. There can be many of these links on a single line of text and some may already have the label. For example

Code:
href="dir/blaba.pdf"... href="dir/blabla label.pdf" ... href="dir/dingdangdong.pdf"

I want the result to end up as

Code:
href="dir/blaba label.pdf"... href="dir/blabla label.pdf" ... href="dir/dingdangdong label.pdf"

i.e. the text ' label' gets preprended to the filename before the .pdf.

It has to be done with sed. I have tried

Code:
/dir\/[^l]*abel.pdf/! {s/\(dir\/[^\.]*\).pdf/\1 label.pdf/gi}

but that will add an extra ' label' to the middle of the 3.

Any suggestions on how to achieve this?

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data.
Last edited by zaxxon; 11-13-2012 at 04:21 AM.. Reason: code tags
# 2  
Old 11-13-2012
Is it always the 2nd href tag you are looking for as source? How do you specify your source filename to take?

Maybe like this:
Code:
root@woelp:/home/zaxxon# sed 's/[^l][^a][^b][^e][^l]\.pdf/& label.pdf/g' infile
href="dir/blaba.pdf label.pdf"... href="dir/blabla label.pdf" ... href="dir/dingdangdong.pdf label.pdf"

# 3  
Old 11-13-2012
Quote:
Originally Posted by zaxxon
Is it always the 2nd href tag you are looking for as source? How do you specify your source filename to take?

Maybe like this:
Code:
root@woelp:/home/zaxxon# sed 's/[^l][^a][^b][^e][^l]\.pdf/& label.pdf/g' infile
href="dir/blaba.pdf label.pdf"... href="dir/blabla label.pdf" ... href="dir/dingdangdong.pdf label.pdf"

The filenames can be anywhere in the line, there can be any number.

Your example doesn't give the wanted output. I want

Code:
href="dir/blaba label.pdf"... href="dir/blabla label.pdf" ... href="dir/dingdangdong label.pdf"

You've added label.pdf after the existing pdf.
# 4  
Old 11-13-2012
Quote:
Originally Posted by adb
It has to be done with sed.
Why?

Regards,
Alister
# 5  
Old 11-13-2012
Quote:
Originally Posted by alister
Why?

Regards,
Alister
That's the tool being used for all the other conversions being made.
# 6  
Old 11-13-2012
Code:
sed 's/ label\.pdf"/\
/g; s/href="\([^"]*\)\.pdf"/href="\1 label.pdf"/g; s/\n/ label.pdf"/g'

Assume that any occurrence of label.pdf" concludes an href attribute's value. Convert all such occurrences to a newline, so that those href attributes are temporarily broken and not seen by the function that will insert the label. Insert the label into the remaining href attributes whose value is a pdf file. Undo the newline conversion to restore the pre-existing labels.

Regards,
Alister
This User Gave Thanks to alister For This Post:
adb
# 7  
Old 11-13-2012
Quote:
Originally Posted by alister
Code:
sed 's/ label\.pdf"/\
/g; s/href="\([^"]*\)\.pdf"/href="\1 label.pdf"/g; s/\n/ label.pdf"/g'

Assume that any occurrence of label.pdf" concludes an href attribute's value. Convert all such occurrences to a newline, so that those href attributes are temporarily broken and not seen by the function that will insert the label. Insert the label into the remaining href attributes whose value is a pdf file. Undo the newline conversion to restore the pre-existing labels.
Brilliant. I figured that was what was needed, but just wasn't able to get there...
Many thanks Alister
Antony
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