hi All,

I have a file like this;

aaaaaaaaaa

bbbbbbbb

cccccc

ddddddddddd

........

xxxxxxxxxxxx

I want to delete hole lines and it must be like this

aaaaaaaaaa
bbbbbbbb
cccccc
ddddddddddd

how can I do this ??

R.

Alice

Edit the file using vi editor then type in
dd on the empty space this will delete the line

the procedure is

vi filename
dd

then :wq to save

I have more than 1500 line and 30 files. if I use vi and "dd" I can complete until end of my life.

In order to automate this we will need a more clear definition of the problem. Your example seems to imply that you want to keep only the first four non-blank lines. Is this correct?

yes thats right.
this file is contaings 1530 lines and it has blank lines between each lines. I want to delete blank lines in this files.

You can use awk

awk '{if ( $1 != "") print $1}' < file.in > file.out

file.in is your input file name &
file.out is your output file name

cat file.in | grep -v ^$ > file.out

This will use the descriptors ^ for beginning of line and $ for end of line to match a blank line and remove from output with the -v option of grep.

Cool...

It may be less efficient than awk but still valid. And less syntax problems.