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Full Discussion: Why awk perform differently when using variable?
Top Forums Shell Programming and Scripting Why awk perform differently when using variable? Post 302932335 by ken6503 on Tuesday 20th of January 2015 09:01:37 PM
Old 01-20-2015
Quote:
Originally Posted by MadeInGermany
If /abcd/ is a literal string abcd,
then /a/ is a literal string a.
$0~a is the variable a.
Thanks for your quick response.

I tried the script
I got 2nd and 3rd result. why 1st one gave me error?

Code:
$ cat vartest.ksh
#!/bin/ksh
var=abcd
awk  '$0~a {print "ac", $0} $0!~a {print "su" ,$0}' a="$var" demofile.txt
echo "using -v "
/usr/xpg4/bin/awk -v a=$var '$0~a{print "ac", $0} $0!~a{print "su" ,$0}'  demofile.txt
echo "without variable"
awk  '$0~/abcd/{print "ac", $0} !$0~/abcd/{print "su" ,$0}' demofile.txt

$ ./vartest.ksh
awk: syntax error near line 1
awk: bailing out near line 1
using -v
ac filename-yyyy-abcd
su filename-xxx-week-pass
su filename-xxx-week-run
without variable
ac filename-yyyy-abcd
su filename-xxx-week-pass
su filename-xxx-week-run

 

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LEARN ABOUT DEBIAN

fst-mor

fst-mor(1)							      fst-mor								fst-mor(1)

NAME

       fst-mor - Interactive morphological analyser and generator

SYNOPSIS

       fst-mor [options] file

OPTIONS

       -n     Print multi-character symbols without the enclosing angle brackets.

       -h     Print usage information.

DESCRIPTION

       fst-mor	is  an	interactive  morphological  analyser and generator. The argument is the name of a file which was generated by fst-compiler
       (without using option -c).

       fst-mor reads the transducer which is stored in the argument file and prompts the user for input. Each input line is  processed	until  the
       user enters "q" which ends the program.

       fst-mor has two modes, an analysis mode (default) and a generation mode.  Entering an empty input line switches between the two modes.

       In order to explain what the program does in generation and analysis, consider the following transducer:

	      a b:x c:<> d

       In  generation mode, the program will print "axd" if the user enters "abcd" and "no result" otherwise. In other words, the program maps the
       left symbols to the right symbols of the transducer.

       In analysis mode, the program will print "abcd" if the user enters "axd" and "no result" otherwise.

BUGS

       No bugs are known so far.

SEE ALSO

       fst-compiler

AUTHOR

       Helmut Schmid, Institute for Computational Linguistics, University of  Stuttgart,  Email:  schmid@ims.uni-stuttgart.de,	This  software	is
       available under the GNU Public License.

								   February 2002							fst-mor(1)
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