How to pass variable in awk

[ssandip]

Hi,

Is there any way to pass variable in awk statement. I am trying to write following script which will keep variable in array.
------------------------------------------------
sys="abc bcd dde ccc"
ctr=1
SYSNAME=${sysname[*]}
sysn=`echo $sys | awk '{print NF}'`
while [ $sysn -ge $ctr ]
do
sysname[$ctr]=`echo $sys | awk -F" " '{print $ctr}'`
((ctr=ctr+1))
done
--------------------------------------------------
It is showing following error

awk: Field $() is not correct.
The input line number is 1.
The source line number is 1.

Is there any other way to store those variable.

Thanks in advance.

Sandip

 

[futurelet]

sysname[$ctr]=`echo $sys | awk -F" " '{print $ctr}'`

The [tt]-F" "[/tt] isn't needed.

[tt]
sysname[$ctr]=`echo $sys | awk -v ctr=$ctr '{print $ctr}'`
[/tt]

 

[mikevh]

Looks to me like you're using awk to copy the array $sys into the array $sysname. This is an awfully roundabout way of doing things. However, you can do it this way if you insist. Use the -v option to pass the $ctr variable into awk. See bolded:

sys="abc bcd dde ccc"
ctr=1                                                  
SYSNAME=${sysname[*]} [b]# don't know what this line does?[/b] 
sysn=`echo $sys | awk '{print NF}'`                    
while [ $sysn -ge $ctr ]                               
do                                                     
  sysname[$ctr]=`echo $sys | [b]awk -v ctr=$ctr[/b] '{print $ctr}'` 
  ((ctr=ctr+1))                                        
done

However, wouldn't it be easier just to say sysname=$sys instead of going through all this? (My shell scripting is very rusty, but I tried this and it worked.)

 

[ssandip]

Thanks a lot to both of you.. Yes it worked... Can I use awk array function to store those variable..

 

[Ygor]

You don't say which shell you are using, but you can define an array with values in bash or ksh.

bash:
[tt] declare -a sysname=($sys)[/tt]

ksh:
[tt] set -A sysname $sys[/tt]

 

[mikevh]

Can I use awk array function to store those variable..

Sorry, i don't follow. Explain please?