Re: Yahoo! Groups: Welcome to sed-users. Visit today!

On 27Apr2012 10:23, Luigi Assom <[email protected]> wrote:
| I was finally able to write this syntax which worked for me:
| first I extract url and I save it on a second file:
| sed -n -e 's/\(<a[^h]*href="\)\([^"]*\)"\([^>]*>\)/\2/g; p'
| /Users/gg4u/prova4.txt > /Users/gg4u/prova5.txt
| 
| then I clean out all others html tag and save it on a third file:
| sed -e 's/<[^>]*>//g' /Users/gg4u/prova5.txt > /Users/gg4u/prova6.txt

You can do that in one command like this:

  sed -n -e 's/\(<a[^h]*href="\)\([^"]*\)"\([^>]*>\)/\2/g; p' /Users/gg4u/prova4.txt \
  | sed -e 's/<[^>]*>//g' > /Users/gg4u/prova6.txt

That is two seds piped into each other. The first writes directly to the
pipe and the second reads from the pipe, not from a file.

| A question:
| I have several several source files which I want to process in batch, and I
| want to save only the final results (without saving intermediate file..)
| so from list /Users/.../prova1,2,3,...,6.txt save the results as
| /Users/.../provaa,b,c,d,...txt
| 
| Which way could I use to automate ?

A loop. Example:

  for file in file1 file2 file3
  do
    sed -n -e 's/\(<a[^h]*href="\)\([^"]*\)"\([^>]*>\)/\2/g; p' "$file" \
    | sed -e 's/<[^>]*>//g' >"$file-result.txt"
  done

That reads from "file1" and writes to "file1-result.txt". And so on for
file2 etc.

| I could export list of file to do, but how to use it in batch from the
| terminal?

If the filenames were in a file, you could do this:

  while read file
  do
    sed -n -e 's/\(<a[^h]*href="\)\([^"]*\)"\([^>]*>\)/\2/g; p' "$file" \
    | sed -e 's/<[^>]*>//g' >"$file-result.txt"
  done <your-exported-file-list

where "your-exported-file-list" is the filename you exported to.

At this point it is best to put all this in a small shell script,
so you can edit and run it.

Cheers,
-- 
Cameron Simpson <[email protected]> DoD#743
http://www.cskk.ezoshosting.com/cs/

Carpe Daemon - Seize the Background Process
        - Paul Tomblin <[email protected]>