Re: How to combine lines into paragraphs?

[Wolfgang Laun]

$cat para.awk
BEGIN { RS = RS RS RS; del = ""; } # three RS if two blank lines separate
paragraphs
{ gsub( /\n+/, " " ); print del $0; del = "\n"; }
$cat data
line 1
line 2


line 3
line 4

line 5
line 6
$ gawk -f para.awk <data
line 1 line 2

line 3 line 4 line 5 line 6
$

This assumes that a single blank line should be rendered as a space.

It's a somewhat shaky way of separating paragraphs. What if there are 3, 4,
5,... empty lines? Is a single blank input line really just a space in the
output?

Wolfgang

On Fri, 9 Sept 2022 at 17:17, Peng Yu <pengyu.ut@gmail.com> wrote:

> Here is what I have currently. I am not sure if there is any better
> way to implement it?
>
> {
>     if(/^$/) {
>         if(line != "") {
>             if(!printed) {
>                 printed = 1
>             } else {
>                 print ""
>             }
>             print line
>             line = ""
>         }
>     } else {
>         if(line == "") {
>             line = $0
>         } else {
>             line = line " " $0
>         }
>     }
> }
> END {
>     if(line != "") {
>         if(!printed) {
>             printed = 1
>         } else {
>             print ""
>         }
>         print line
>     }
> }
>
> On Fri, Sep 9, 2022 at 9:56 AM Peng Yu <pengyu.ut@gmail.com> wrote:
> >
> > Hi,
> >
> > ===
> > line1
> > line2
> >
> >
> > line3
> > line4
> > ===
> >
> > For example, for the above input, the output should be the following
> >
> > ===
> > line1 line2
> >
> > line3 line4
> > ===
> >
> > What is the most succinct way to do so in awk?
> >
> > --
> > Regards,
> > Peng
>
>
>
> --
> Regards,
> Peng
>
>

-- 
Wolfgang Laun