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comparing awk and nawk

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# 1  
Old 10-09-2009
comparing awk and nawk
Hi Guys,

i tried these two commands. First in awk and nawk.
The nawk command is running fine but the awk command is throwing error.

What is wrong with the awk command. There are lot of awk commands running fine in my system

Code:
d003:/usr/local/dsadm/dsprod>nawk 'NR = 1 {print " "$0}' a.txt
 51|326|jsdjls
d003:/usr/local/dsadm/dsprod>awk 'NR = 1 {print " "$0}' a.txt
awk: syntax error near line 1
awk: bailing out near line 1

Thanks for your help.

Magesh
# 2  
Old 10-09-2009
Hi.

I can't see anything wrong with the syntax.

But your logic is wrong.

Code:

awk 'NR = 1 {print " "$0}' a.txt

Will set NR to 1, and evaluate to true for every record.

Correct would be:
Code:

awk 'NR == 1 {print " "$0}' a.txt

# 3  
Old 10-09-2009
Or just:
Code:
awk 'NR==1' a.txt

# 4  
Old 10-09-2009
The code suggests a space is required at the start.
# 5  
Old 10-09-2009
Quote:
Originally Posted by scottn
The code suggests a space is required at the start.
Right Smilie
Code:
sed 's/^/ /;q' file

# 6  
Old 10-12-2009
thanks man.. my bad.. i just overlooked it.. one quick question.. which is better sed or awk??
# 7  
Old 10-12-2009
Hi.

For stuff like this, sed. It's quicker than awk if nothing else (although for only changing 1 line, the difference is neglegable)
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