how to remove blank lines in file

Question

In some of the files containing more than 50 lines of code, many blank line appears..... How can i remove those blank lines.....?????

jagannath arumugam · Answer

To remove only blank lines in files, either awk or sed command could be used.

awk command helps to display the file without blank lines, whereas sed could be used to modify the source file itself...

For example:

Assume test file contains 50 lines with blank lines.

To view only:

#awk 'NF' test

To modify file:

#sed -i '/^$/d' test