Unix Variable Reference and Substitution

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Guys, May i know how can we de reference the code reference variable.? my $a = sub{$a=shift;$b=shift;print "SUM:",($a+$b),"\n";}; print $a->(4,5); How can we print the whole function ? Please suggest me regarding this. Thanks for your time :) Cheers, Ranga :)

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Perl: accessing reference to variable inside hash.

Below is hash which contains reference to variables: my %mandatoryFields = ( 1 => \$msgtype, 2 => \$switchtype, 3 => \$card_nbr, 4 => \$natv_tran_type_code, 5 => \$amt_1 ); This...

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How to use variable with command substitution in variable

For example I have variable like below echo $OUTPUT /some/path/`uname -n` when I try to use the variable OUTPUT like below cd $OUTPUT or cd ${OUTPUT} I am getting bad substituion error message $ cd $OUTPUT ksh: cd: bad substitution $ cd ${OUTPUT} ksh: cd: bad substitution ...

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Hi , I have a variable as follows, Temp=`cat ABC.txt | cut -c5-` This will yeild a part of the date. say , 200912. I would like to substitute this variable's value in a filename. eg: File200912F.zip when i say File$TempF.zip , it is not substituting. Any help ? Thanks in...

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Hi! I need to determin the most efficient way to do something (rather simple, I thought). I'm currently echo(ing) a series of menu options, and reading the command input as the number associated with the entry. What I need to do is when the option 1 is selected, that it references a list and...

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How to reference a variable within sed?

Hi all, How can I use sed to perform a substitution if the string that I'm going to substitute is stored in a variable: Let's say: sed 's/abcdefg/good' VS tmp="abcdefg" sed 's/$tmp/good' The second case doesn't work. Guess it's due to the single quotes on the outside. How can I...

Shell Programming and Scripting