A question on [a,ga,na]wk.

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3 total messages Started by Binod K. Taterway Wed, 28 Nov 1990 15:52

#1868

Author: Binod K. Taterway
Date: Wed, 28 Nov 1990 15:52

20 lines
1210 bytes

Is it possible to make use of c-shell variables in [g,n]awk scripts.
What I need to do some thing like this:

  #!/bin/csh
  set AWK=/usr/local/bin/gawk
  set date=`date +%m/%d/%y`
  # Now the awk script that uses $date:
  $AWK -F: '{if ($3 == $date) {print $0}}' <source-file>
  # End of shell script.

I checked  with [g,n]awk. Only gawk  can access environment variables,
but I do not want to  do  "setenv date= ..",  just "set date= ..". Any
suggestions? Or, am I stuck with using setenv?

Thanks in advance.

/Binod.
--------------------
Binod Taterway		bt00@pl118a.cc.lehigh.edu | bt00@lehigh.bitnet
User Consultant, Lehigh University, Bethlehem, PA 18015	(215) 758-3984

Re: A question on [a,ga,na]wk.

#1871

Author: Arnold Robbins
Date: Fri, 30 Nov 1990 19:39

28 lines
1642 bytes

In article <BT00.90Nov28155200@PL118d.?> bt00@PL118d.? (Binod K. Taterway) writes:
>Is it possible to make use of c-shell variables in [g,n]awk scripts.
>What I need to do some thing like this:
>
>  #!/bin/csh
>  set AWK=/usr/local/bin/gawk
>  set date=`date +%m/%d/%y`
>  # Now the awk script that uses $date:
>  $AWK -F: '{if ($3 == $date) {print $0}}' <source-file>
>  # End of shell script.

You can do variable assignments to awk variables on the command line.
The behaviour is most consistent with gawk and very recent versions of
nawk, but this should work with all awk variants:

	set date=`date +%m/%d/%y`
	$AWK -F: '{if ($3 == date) {print $0}}' date="$date" <source-file>

Of course, your awk program might better be written as

	$AWK -F: '$3 == date' date="$date" <source-file>

See the gawk manual for full details on the way the awk command line works.
-- 
Arnold Robbins				AudioFAX, Inc. | Laundry increases
2000 Powers Ferry Road, #200 / Marietta, GA. 30067     | exponentially in the
INTERNET: arnold@audiofax.com Phone:   +1 404 933 7612 | number of children.
UUCP:	  emory!audfax!arnold Fax-box: +1 404 618 4581 |   -- Miriam Robbins

Re: A question on [a,ga,na]wk.

#1953

Author: Walter Bays
Date: Fri, 14 Dec 1990 01:53

22 lines
1140 bytes

In article <BT00.90Nov28155200@PL118d.?> bt00@PL118d.? (Binod K. Taterway) writes:
>Is it possible to make use of c-shell variables in [g,n]awk scripts.

I often do it like...

#!/bin/ksh
Tempfile="c4sim.tmp$$"
...
nawk '
    ...
    print ... >$Tempfile
    ...
    ' "Tempfile=$Tempfile" "Version=$Version" $*

---
Walter Bays		Phone (415) 852-2384	FAX (415) 856-9224
EMAIL walter@apd.ingr.com
USPS: Intergraph APD, 2400 Geng Road, Palo Alto, California 94303
-- 
Walter Bays		Phone (415) 852-2384	FAX (415) 856-9224
EMAIL walter@apd.ingr.com	or	...!ingr!apd!walter
USPS: Intergraph APD, 2400 Geng Road, Palo Alto, California 94303

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