topic Re: join lines in a file using getline in Operating System - HP-UX

join lines in a file using getline

lawrenzo_1 — Tue, 12 Feb 2008 14:33:19 GMT

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.

Re: join lines in a file using getline

Oviwan — Tue, 12 Feb 2008 14:38:32 GMT

hey

sed solution:

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

Regards

Re: join lines in a file using getline

lawrenzo_1 — Tue, 12 Feb 2008 14:58:24 GMT

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 ....

Re: join lines in a file using getline

James R. Ferguson — Tue, 12 Feb 2008 15:03:50 GMT

Hi Chris:

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

Regards!

...JRF...

Re: join lines in a file using getline

Oviwan — Tue, 12 Feb 2008 15:07:49 GMT

hence delete all empty line before concatenate:

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

Re: join lines in a file using getline

lawrenzo_1 — Tue, 12 Feb 2008 15:54:41 GMT

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 ....

Re: join lines in a file using getline

James R. Ferguson — Tue, 12 Feb 2008 16:06:54 GMT

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...

Re: join lines in a file using getline

lawrenzo_1 — Tue, 12 Feb 2008 16:25:29 GMT

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.

Re: join lines in a file using getline

James R. Ferguson — Tue, 12 Feb 2008 20:36:04 GMT

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...

Re: join lines in a file using getline

Saini — Tue, 11 Nov 2008 22:51:13 GMT

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