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To print variables using awk

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# 1  
Old 12-19-2011
To print variables using awk
Can anyone help me with how to print the variable using a awk statement.

Code:
for i in ` cat serverlist.txt ` ; do 
my command | awk '{print $1 $2 $i}' 
done

It should print like below but it is not

Code:
XXXXX YYYYY Servername 
XXXXX YYYYY Servername 
XXXXX YYYYY Servername 
XXXXX YYYYY Servername

The last column is what I am adding and printing from the variable $i.

Any help please ?

Regards,

Ravikumar R
Last edited by zxmaus; 12-19-2011 at 05:43 PM.. Reason: use code tags please
# 2  
Old 12-19-2011
Code:
for i in ` hostname ` ; do 
df -k | awk -v i=$i '{print $1, $2, i}' 
done

However the df -k part does not work that way, except in some clustered environments.
hostname will give single result, so i will always be the same....

What are you trying to do? What we see does not make clear sense.
Last edited by jim mcnamara; 12-19-2011 at 06:32 PM.. Reason: hightlight changes
# 3  
Old 12-19-2011
Thanks for the quick reply. Ok I just put the command an example.

I am using a different command where it is printing the $1 and $2 fine, I want to add a last column which should be the hostname and should read from the $i ( from the for loop)


example

Code:
for i in ` cat serverlist.txt ` ; do 
my command | awk '{print $1 $2 $i}' 
done

It should print like below but it is not

Code:
XXXXX YYYYY Servername 
XXXXX YYYYY Servername 
XXXXX YYYYY Servername 
XXXXX YYYYY Servername

The last column is what I am adding and printing from the variable $i.

Any help ?
Last edited by zxmaus; 12-19-2011 at 05:41 PM.. Reason: added tags
# 4  
Old 12-19-2011
Re-read my post above. the red part - that is your help.
This User Gave Thanks to jim mcnamara For This Post:
rrb2009
# 5  
Old 12-19-2011
Thanks a lot .. It works like a charm
# 6  
Old 12-20-2011
A little complement...
If the variable you use in awk contains blanks (" ") you will need to add quotes like following:

for i in ` hostname ` ; do
df -k | awk -v i="$i" '{print $1, $2, i}'
done


Of course, it's useless in this example (a hostname won't have a space in it's name)

But try:
i="` hostname ` is my host"
echo $i
df -k | awk -v i=$i '{print $1, $2, i}'
myhost.domain is my host
awk: cmd. line:1: fatal: cannot open file `my' for reading (No such file or directory)
whereas this works
i="` hostname ` is my host"
echo $i
df -k | awk -v i="$i" '{print $1, $2, i}'
This User Gave Thanks to Bernard For This Post:
rrb2009
# 7  
Old 12-20-2011
Thank you so much for the info. I will try this one too. Basically I am not using the df -k command , but i just put that here for example but realized later that it is not a right example.

BTW thanks for the info and I will give a try

Regards,

Ravi
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