Remove blank line from awk output

问题

I am trying to remove leading whitespace from awk output. When I use this command, a leading whitespace is displayed.

diff  test1.txt test.txt | awk '{print $2}'

output: 

asdfasdf.txt
test.txt
weqtwqe.txt

How can I remove the leading whitespace using awk?

Thanks in advance

回答1:

if you want to print the lines where $2 exists you can do it conditionally on number of fields

awk 'NF>1{print $2}'

will do.

来源：https://stackoverflow.com/questions/32789063/remove-blank-line-from-awk-output