Deleting the emty rows in a file

Shell Programming and Scripting
1

I am getting some spaces between the two lines(rows) in file.i want delete that empty rows in the file

example

         1     abc         xyz


	2     def          jkl

like i am having lots of rows in a file i want to delete the spce between the two rows give any script for my requirement

thanks

2

it will also remove the if any line contains just spaces... you can remove [ ]* from the below line if you don't want that..

sed '/^[ ]*$/d' filename

3

here is some more,

awk '{ if ( length($0) > 0 ) print $0 }' file

grep -v ^$ file

sed '/^$/d' file

awk 'length > 0' file
4

Or just...

awk NF file
5

Very interesting Ygor....

the below one also works, I'm learning lot of good stuff from this site...

nawk length tmp1

6

Hi Ygor,
Can you please explain the command you gave, how is it actually working

awk NF filename

Thanks,
Gaurav

7

as i thought the above awk command should bail out and it did
( in ksh -sun box)

rather this worked,

awk '{ if( NF ) print }' samplefile

could you please explain?

8

On Solaris use nawk.

Awk programs take the form: condition {action} where each condition is evaluated against each input record. A missing action means print the whole record. NF is a built-in variable which holds the number of fields. A condition evaluates to true when non-zero or non-empty.