[SOLVED] Print commands in history consisting in just one word

Issue

I want to print lines that contains single word only.

For example:

this is a line
another line
one
more
line
last one

I want to get the ones with single word only

one
more
line

EDIT: Guys, thank you for answers. Almost all of the answers work for my test file. However I wanted to list single lines in bash history. When I try your answers like

history | your posted commands 

all of them below fails. Some only prints some numbers (might line numbers?)

Solution

You want to get all those commands in history that contain just one word. Considering that history prints the number of the command as a first column, you need to match those lines consisting in two words.

For this, you can say:

history | awk 'NF==2'

If you just want to print the command itself, say:

history | awk 'NF==2 {print $2}'

Answered By - fedorqui 'SO stop harming'