join lines in a file using getline

[lawrenzo_1]

I want to use awk (although there are many other ways) to join two lines in a file:

my data
some more data

my data
some more data


I want the output like

my data some more data
my data some more data

I have been looking at using the getline function to do this but I cannot quite get the systax

anyone know the best solution using awk?

thanks

Chris.

[Oviwan · Accepted solution]

hey

sed solution:

sed '$!N;s/\n/ /' filename

Regards

[lawrenzo_1]

ok so this works on a single line file but not a file with multiple lines

s:-(


# cat chris1
this is the start
and this is the end

this is the start
and this is the end

this is the start
and this is the end

#sed '$!N;s/\n/ /' chris1
this is the start and this is the end
this is the start
and this is the end
this is the start and this is the end

or my awk effort:

# awk '{printf $0;getline;print " "$0}' chris1
this is the start and this is the end
this is the start
and this is the end
this is the start and this is the end


I wil keep trying ....

[James R. Ferguson]

Hi Chris:

# awk '{if (NR%2==1) {getline X};print $0,X}' file

Regards!

...JRF...

[Oviwan]

hence delete all empty line before concatenate:

sed '/^$/d;$!N;s/\n/ /' file

[lawrenzo_1]

hi james,

still the same output from your command:

[root@brli013a tmp]# awk '{if (NR%2==1) {getline X};print $0,X}' chris1
this is the start and this is the end
this is the start
and this is the end
this is the start and this is the end
and this is the end

but the sed example is good ....

[James R. Ferguson]

Hi (again) Chris:

Oh, so the blank lines were really there...

# awk '/^[[:space:]]*$/ {next};{if (i==0) {getline X;i=1};i=0;print $0,X}' file

Regards!

...JRF...

[lawrenzo_1]

brilliant thanks both,

and james you have given me a solution 2 for the price of 1, I amended the original file so no lines and it works ( of course )

[root@brli013a tmp]# awk '{if (NR%2==1) {getline X};print $0,X}' chris1
this is the start and this is the end
this is the start and this is the end
this is the start and this is the end


and the second solution also works well.

Chris.

[James R. Ferguson]

Hi (again) Chris:

The last suggestion of mine had extraneous (useless) code embedded, It should simply be:

# awk '/^[[:space:]]*$/ {next};{getline X;print $0,X}' file

NO POINTS FOR THE CORRECTION.

Regards!

...JRF...

[Saini]

Hi

I have a problem similar to the one above. But, in my case the file is of this format.
---
line1.1
line1.2
line1.3

line2.1
line2.2
line2.3
line2.4

line3.1
line3.2
---
I want the following output
---
line1.1line1.2line1.3

line2.1line2.2line2.3line2.4

line3.1line3.2
---
So, basically I've to join the lines until a empty line is encountered. Then , i have to skip it and start joining other lines. I am unable to do it with my limited knowledge of awk.
Any help is appreciated.
Thanks
Saini