Shell Programming and Scripting

Hi,

I want to know that, how to inter change the lines.
In the following file two line are there first one is conatin PD next line PY.
But i want to first line PY and next line PD.

My file structure is like this:

TI Electronic Publishing
AU Robert
PD NOV 11
PY 2000
AB This is deals with electronic publishing and open access.

TI Digital Library
AU David
PD DEC 12
PY 2006
AB This is deals with electronic publishing and open access.

Let me know how to change the lines.

Shankarao

Try...

Code:

awk '{if ($1=="PD") pd=$0; else if ($1=="PY") print $0 ORS pd; else print $0}' file1

Or in short form...

Code:

awk '$1=="PD" {pd=$0; next} {print} $1=="PY" {print pd}' file1

With related with my earlier mail is tried with following code but its giving errror,

awk '$1=="PD" {pd=$0; next} {print} $1=="PY" {print pd}' file1

let me know how to exchange the lines.

shankarao

Hi,
I tried with this command it works fine, Now i want to open the file and store the result in that file.
awk '{if ($1=="PD") pd=$0; else if ($1=="PY") print $0 ORS pd; else print $0}' 2000.txt

Let me know how to open and save the result in that file.

With regards,
Shankarao

You cannot do that with awk (atleast to my knowledge). What you can do instead is this:

Code:

awk '{if ($1=="PD") pd=$0; else if ($1=="PY") print $0 ORS pd; else print $0}' 2000.txt > 2000.txt.tmp; mv 2000.txt.tmp 2000.txt

Code:

sed "/^PD/{N;/\nPY/{s/\(.*\)\n\(.*\)/\2\n\1/;};}" file