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casperdaghost 10-18-2011 10:12 PM
awk andvariable interpolation
 
Is there a way that I can interpolate variable in the begin statement in awk?

All i am doing here is piping the output through an ls -ltr command and checking for all files from todays date in a directory with awk.
Sure there is a way to do it in bash - but I am trying to figure out how to do it in awk.


Code:
#!/usr/bin/awk -f
BEGIN {
        FS=" ";
        mydate=`/bin/date +%Y-%m-%d`
        }
{ if ($6 ~ /mydate/) {
        print $6 , $8
        sleep 1;

        }
}

ChrisCPearson 10-18-2011 11:43 PM
In AWK, to pipe the output of a command into a variable:
command | getline [var]
Here's your complete program:

Code:
#!/usr/bin/awk -f
BEGIN {
    "date +%Y-%m-%d" | getline today
}
$6 == today {
    print $6, $8
}

Tinkster 10-18-2011 11:59 PM
Quote:
Originally Posted by casperdaghost (Post 4502000)
Is there a way that I can interpolate variable in the begin statement in awk?

All i am doing here is piping the output through an ls -ltr command and checking for all files from todays date in a directory with awk.
Sure there is a way to do it in bash - but I am trying to figure out how to do it in awk.


Code:
#!/usr/bin/awk -f
BEGIN {
        FS=" ";
        mydate=`/bin/date +%Y-%m-%d`
        }
{ if ($6 ~ /mydate/) {
        print $6 , $8
        sleep 1;

        }
}
Just a word of warning: if you have filenames w/ spaces in them
your awk output for $8 won't be quite what you expected.



Cheers,
Tink

Tinkster 10-19-2011 12:00 AM
Quote:
Originally Posted by ChrisCPearson (Post 4502034)
In AWK, to pipe the output of a command into a variable:
command | getline [var]
Here's your complete program:

Code:
#!/usr/bin/awk -f
BEGIN {
    "date +%Y-%m-%d" | getline today
}
$6 == today {
    print $6, $8
}

Hi, welcome to LQ,

And nice first post. ;}



Cheers,
Tink

grail 10-19-2011 02:31 AM
As per Tink's warning, you may have even been given this link before as why you should avoid
parsing ls.

casperdaghost 10-19-2011 07:57 AM
Hey - great work guys.


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