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Using current line in a command in AWK

 
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# 1  
Old 01-16-2011
Data Using current line in a command in AWK
Hi, Im trying to get current line in the AGREP command I use in AWK. My script looks like this:

Code:
list.txt
car
bus

checklist.txt
cer
buss

cat list.txt | awk -v mycmd="$(agrep -2 -i $0 checklist.txt)" '{print $mycmd}'

It doesnt work. How can I get the current line in the $0 variable? Or is there any different solution? I need to go through each line in list.txt, search & compare it in checklist.txt and get a result.

Thank u for ur responses.
# 2  
Old 01-16-2011
Not just any awk uses variables. Use gawk or nawk if available. Otherwise use your inline function embedded as you have above; you'll just need to escape it, or wrap it within an eval statement.
# 3  
Old 01-16-2011
Pls could you give me an example how to get the var in some unix command in nawk or gawk?
# 4  
Old 01-16-2011
As per the awk manpage:
OPTIONS
Gawk accepts the following options:
-v var=val
--assign var=val
Assign the value val to the variable var, before execution of the program begins. Such variable values are available to the BEGIN block of an AWK program.
For example:
Code:
trogdor $ awk -vVAR=uservalue 'BEGIN {print VAR;}' /dev/null

will print to stdout:
Code:
uservalue

Note that:
Code:
trogdor $ awk 'BEGIN {print VAR;}' VAR=anothervalue /dev/null

will print to stdout:
Code:
(an empty line)

(I could not get an empty line to show up in a code block), as VAR has not yet been assigned.
However:
Code:
trogdor $ echo | awk '{print VAR;}' VAR=anotheruservalue

will print to stdout:
Code:
anotheruservalue

# 5  
Old 01-16-2011
Hi, thank you all for ur responses. Im not sure if i get.

I need to get a line (from list.txt) in the variable var, that AWK processes and use agrap on it. The first line is represented as $0.
# 6  
Old 01-16-2011
Can you provide a somewhat longer example of your input files, and what you expect the output to be.
# 7  
Old 01-16-2011
Input:

Code:
cat list.txt

output:
computer
mobile
users

cat list2.txt 

output:
computers
mobil
dogs

What want is to take words one by one from the list.txt, let search each word in the list2.txt and find similar word.
 
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