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Insert text at the beginning of every even number line

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# 1  
Old 04-03-2016
Insert text at the beginning of every even number line
i am trying to
insert text at the beginning of every even number line
with awk

i can do it with odd number lines
with this command

Code:
awk 'NR%2{$0="some text "$0}1' file

how can i edit this command

thanks
# 2  
Old 04-03-2016
Do you mean something like:
Code:
awk 'NR%2 == 1{$0="some text "$0}1' file

This User Gave Thanks to Don Cragun For This Post:
bob123
# 3  
Old 04-03-2016
Quote:
Originally Posted by Don Cragun
Do you mean something like:
Code:
awk 'NR%2 == 1{$0="some text "$0}1' file

thanks for reply

i changed the == 1 to 2==0
now it works many thanks great forum


Code:
awk 'NR%2==0{$0="some text "$0}1' file

# 4  
Old 04-03-2016
Quote:
Originally Posted by bob123
thanks for reply

i changed the == 1 to 2==0
now it works many thanks great forum


Code:
awk 'NR%2==0{$0="some text "$0}1' file

Ouch. Yes. Sorry. I wasn't paying close enough attention.

I'm glad you got it to work.
This User Gave Thanks to Don Cragun For This Post:
bob123
# 5  
Old 04-04-2016
Or you may use negation in your original command as follows:

Code:
awk '!NR%2{$0="some text "$0}1' file

# 6  
Old 04-04-2016
Quote:
Originally Posted by krishmaths
Or you may use negation in your original command as follows:

Code:
awk '!NR%2{$0="some text "$0}1' file

Not quite. In awk ! has higher precedence than % so that evaluates as (!NR)%2. But:
Code:
awk '!(NR%2){$0="some text "$0}1' file

would work.
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