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I have same question asked here in latest,but i have something different problem. Ex:

Input file

****************** .WER + aaa bbb ccc + ddd eee ****************** .SDF + zzz xxx yyy + iii + kkk lll ****************** .XCV + uuu vvv ggg + hhh qqq ******************

Desired Output:

****************** .WER aaa bbb ccc ddd eee ****************** .SDF zzz xxx yyy iii kkk lll ****************** .XCV uuu vvv ggg hhh qqq ******************

So as per above i have file where no of line is no certain. It can be 2,3 or 4 and every record separated with ****************** whether it is possible to convert all lines of each record in single line? For exact no of lines i have succesfully used paste -s -d ' \n'.

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    Didn't you just ask this exact same question a few days ago? See unix.stackexchange.com/q/537908/133219. Or is this homework for a class you and some other people are taking? Commented Sep 2, 2019 at 18:52

2 Answers 2

Reset to default
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$ sed -e :a -e '$!N;s/ *\n+ / /;ta' -e 'P;D' testfile ****************** .WER aaa bbb ccc ddd eee ****************** .SDF zzz xxx yyy iii kkk lll ****************** .XCV uuu vvv ggg hhh qqq ******************

http://sed.sourceforge.net/sed1line.txt holds a similar example.

  • :a create the label 'a'

  • $!N append the next line (and a newline) to the pattern space, IF it is not the last line ($!)

  • s/ *\n+ / / Replace trailing spaces, the newline, the + and the space after it with a single space

  • ta jump back to label a

  • Print the pattern space. This will produce double output, because we didn't use the -n-option to sed, so now, we need to

  • Delete the superfluous output.

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  • Great, would you explain the code? Commented Sep 2, 2019 at 18:24
  • Well done, but you need to put explanations in for credit. It's the way it works on this site. Commented Sep 2, 2019 at 18:46
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If you really want to use awk, then at least with GNU awk you could do something like

$ gawk -vRS='\n[*]+' -F'[ ]*\n[+][ ]*' '{NF+=0; ORS=RT} 1' file ****************** .WER aaa bbb ccc ddd eee ****************** .SDF zzz xxx yyy iii kkk lll ****************** .XCV uuu vvv ggg hhh qqq ******************

which simply sets appropriate record and field separators, and forces re-assembly of the record with default (single space) field separators.

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  • Sorry for addition but it is possible to print particular column instead of whole line. Update will very helpful Commented Sep 3, 2019 at 8:30
  • @KalpeshBhoj please edit your question - or ask another. You will need to be more specific than "print particular column". Commented Sep 3, 2019 at 9:58

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