What about a mixed case? I want variable substitution in part of the command.

 $boot_device = q awk 'FNR == 2 { print $1 }'; 
 $boot_device = `$boot_device`; 
 print "$boot_device\n";   

 $UUID_boot = q awk '{ print $2 }' | sed 's/"//g';
 $UUID_boot = `$UUID_boot`; 
 $print "$UUID_boot\n";

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I want $boot_device to be variable expanded but I don't want $2 to be expanded. Using q, the command is being sent as 

blkid $boot_device | awk '{ print $2 }' | sed 's/"//g'

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Using qq the command is being sent as 

blkid /dev/md126p1 | awk '{ print }' | sed 's/"//g'

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which results in an error.

In reply to Re^2: system call (backticks) with pipes by Anonymous Monk
in thread system call (backticks) with pipes by papai

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