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sed with pattern using variable

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Old Unix and Linux 01-11-2018   -   Original Discussion by mystition
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Quote:
Originally Posted by MadeInGermany View Post
Ah, of course, the d command jumps to the next input cycle, so the following commands are not run.
Actually this was not the case in my test and the script worked as it was shown here. For reference, i used Linux (Kernel 4.10.42) and GNU-sed 4.2.2, shell is Kornshell 93 u+.

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Old Unix and Linux 01-12-2018   -   Original Discussion by mystition
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Code:
man sed
...
d

Delete pattern space. Start next cycle.

You must test with an input file that has a further <Description>xyz</Description> after (outside) the <OfferDefinition Id=...> ... </OfferDefinition> block.
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Old Unix and Linux 01-14-2018   -   Original Discussion by mystition
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Quote:
Originally Posted by MadeInGermany View Post
Also doable with sed, continuing on your attempt


Code:
sed -e '/<OfferDefinition Id="/ {h; s/.*=" *//; s/ *">.*//; x; n;}' -e '/<Description>/ {H; x; s/\(.*\)\n\(.*<Description>\)/\2\1_/;}' file.txt

Better readable in two lines


Code:
sed '
  /<OfferDefinition Id="/ {h; s/.*=" *//; s/" *>.*//; x; n;}
  /<Description>/ {H; x; s/\(.*\)\n\(.*<Description>\)/\2\1_/;}
' file.txt

Of course digging out the saved value from the hold space is a bit of a hack (also in the previous post).
While the other codes using awk were giving slight errors (while printing the 'id' in 'description', they were replacing the existing text) which could be tweaked, your code worked perfectly. Many Thanks!

---------- Post updated at 05:17 PM ---------- Previous update was at 05:03 PM ----------

Quote:
Originally Posted by RudiC View Post
Try also


Code:
awk -F\" '/OfferDefinition>/ {ID = $2} /Description>/ {sub (/>/, "&" ID "_")} 1' file
Thanks Rudi, you are always helpful. Worked with a little bit of tweak in separators:



Code:
 awk -F\" '/OfferDefinition>|="/ {ID = $2"_"} /Description>/ {sub (/>/, "&" ID )} 1' file

However, can you explain why you have used '1' at the end? I tried removing it to understand but the code doesn't work without it...

BR//
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Old Unix and Linux 01-14-2018   -   Original Discussion by mystition
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awk works in

Code:
pattern {action}

pairs. If pattern evaluates to TRUE, the respective action is executed. 1 is always TRUE, and for a missing actions the default, print, will be taken.
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