syntax about getline of awk

Shell Programming and Scripting
1

i want to use getline to read command output to a var
but the command i want to run is composed of a string and a variable,example:

echo "" | awk 'BEGIN{myfile="anyfilename"}{"ls -l "myfile | getline a;print a}'

and i got a error

sh: anyfilename: command not found

it seems awk just ignored the string "ls -l "
so,whats the right syntax ,thanks

2

It seems that the file "anyfilename" doesn't exist in the actual directory.
BTW the echo statement is redundant here.

Regards

3

it run "anyfilename" as a command,not "ls -l anyfilename" that what i want
anyfilename just for example,it can be any exist file
i use gawk btw
any help?

4

This works fine for me:

awk 'BEGIN{myfile="anyfilename";"ls -l " myfile | getline a;print a}'
5

it doesn't work on RHEL...
so is it a dead end?....