Shell Programming and Scripting

Dear Friend,

You can use the following code, to delete the blank lines from a file

The file contains the following content
welcome1

welcome2

welcome3

Code:

 
sed -i -e '/^$/D'  file

After execute the above code, the file content is
welcome1
welcome2
welcome3

Here -i is used to affect the file

You use the following command to remove the blank lines from a file.

sed -i '/^$/d' filename

d - This is used to clear the content of the pattern space.
D - This is used to remove the first line in the pattern space.Not all the contents.
So,d is preferable than D.

Code:

sed -i '/./!d' input file.

This also will remove the blank line from the input file

Code:

grep . infile > outfile

My money's on Corona688 and carriage returns in the data. So far, all other suggestions in the thread are variations on attempts listed in the original post. If those failed, so will the suggestions.

Just my 2 cents

If Corona688's suggestion does not work, take a look at the file using od to determine if those blank lines contain an "invisible" byte other than \r :

Code:

od -c inputfile

Cheers,
Alister