Help with awk.

CiCa · #1 02-22-2013

Hi,

Is it possible to assign awk results into variables inside the '{}'

e.g.

Code:

 ... ... ... | awk -F"/" '{print $1 = day,$2 = month 2,$3 = year}'

balajesuri · #2 02-22-2013

Quote:

Originally Posted by CiCa

Basically up to the awk point the input is the date in dd/mm/yy format and rather than run the command three times and assign day, month year in three separate commands, I was hoping to do it all in one - something similar to the above. Is this possible?

I really don't understand the highlighted statement. Did you mean, assign day, month and year in three "separate variables"? If so, why would you want to assign them to different variables? You can use them as $1, $2, $3...

And variable assignment is always "variable = value", not the other way round.
$1 = day is same as doing 5 = x in algebra.

CiCa · #3 02-22-2013

OK - to try and explain a little better...

I have to read and check dates on multiple line of output and I need to read the day, month and year into three separate variables, so I can test/compare against them, so...

Rather than doing:

Code:

day = `pntadm -P 111.222.333.444 | awk '{print $5}' | egrep -v "Forever|Zero" | awk -F"/" '{print $1}'`
month = `pntadm -P 111.222.333.444 | awk '{print $5}' | egrep -v "Forever|Zero" | awk -F"/" '{print $2}'`
year = `pntadm -P 111.222.333.444 | awk '{print $5}' | egrep -v "Forever|Zero" | awk -F"/" '{print $3}'`

RudiC · #4 02-22-2013

If your shell (bash, ksh do) supports this, you can use a combination of process substitution and redirection:

Code:

$ read X Y Z < <( awk 'BEGIN {print "A B C"}' )
$ echo $X $Y $Z
A B C

balajesuri · #5 02-22-2013

Or you could put them in an array:

Code:

x=( $(pntadm -P 111.222.333.444 | awk '{print $5}' | egrep -v "Forever|Zero" | awk -F"/" '{print $1,$2,$3}') )
echo ${x[0]} ## Day
echo ${x[1]} ## Month
echo ${x[2]} ## Year

CiCa · #6 02-22-2013

Thanks RudiC,

Seen your last post and I'm trying variations of:

Code:

read day month year < `pntadm -P 111.222.333.444 | awk '{print $5}' | egrep -v "Forever|Zero" | awk -F"/" '{print $1,$2,$3}'`;echo $day $month $year;

RudiC · #7 02-22-2013

See the TWO < < ? Read the shell's man page on process substitution, and please use exactly the syntax provided : < < ( ... ) . NO backtics etc.

BTW - your lenghty pipe could be way more efficient (untested):

Code:

pntadm -P 111.222.333.444 | awk -F"/"  '!/Forever|Zero/ {print $....}'

Thread Tools	Search this Thread
Show Printable Version Email this Page Subscribe to this Thread	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
Passing awk variable argument to a script which is being called inside awk	vivek d r	Shell Programming and Scripting	2	02-11-2013 06:37 AM
HELP with AWK one-liner. Need to employ an If condition inside AWK to check for array variable ?	shell_boy23	Shell Programming and Scripting	6	07-10-2012 05:20 AM
awk command to compare a file with set of files in a directory using 'awk'	anandek	Shell Programming and Scripting	10	05-30-2012 09:21 AM
scripting/awk help : awk sum output is not comming in regular format. Pls advise.	rveri	Shell Programming and Scripting	3	11-06-2009 07:47 PM
Awk problem: How to express the single quote(') by using awk print function	patrick87	Shell Programming and Scripting	4	10-06-2009 07:36 AM

The Following User Says Thank You to RudiC For This Useful Post:
CiCa (02-22-2013)