interpolation

[new2perl]

Assigning a variable.
Then reading in text file that uses the variable.
It's isn't resolved.

Input file:
Your name is: $name

Script:
#!/bin/perl

$name="Rupert";
$text="textin";

open (MYFILE, $text) or die "cant open erik";

while (<MYFILE>) { $value = $_ }

print "$value";


Output:
Your name is: $name


Output that I want:
Your name is Rupert.


What am I doing wrong here ?

Bob

 

[Tad McClellan]

Assigning a variable.
Then reading in text file that uses the variable.
It's isn't resolved.

Of course not. Data is not the same thing as Code.

Input file:
Your name is: $name

Script:
#!/bin/perl

use strict;
use warnings;

$name="Rupert";

my $name="Rupert";

$text="textin";

open (MYFILE, $text) or die "cant open erik";

You did not try to open "erik", you tried to open "textin".

while (<MYFILE>) { $value = $_ }

That reads all the lines, and discards all of them except the last line.

print "$value";

print $value;

perldoc -q vars

What’s wrong with always quoting "$vars"?

Output:
Your name is: $name


Output that I want:
Your name is Rupert.


What am I doing wrong here ?

Conflating what is "data" with what is "code".


Your Question is Asked Frequently:

perldoc -q expand

How can I expand variables in text strings?


However, I'm quite sure that you are asking the wrong question.

You should instead be asking about Templating systems.

 

[new2perl]

Of course not. Data is not the same thing as Code.



use strict;
use warnings;


my $name="Rupert";



You did not try to open "erik", you tried to open "textin".


That reads all the lines, and discards all of them except the last line.


print $value;

perldoc -q vars

What's wrong with always quoting "$vars"?




Conflating what is "data" with what is "code".

Your Question is Asked Frequently:

perldoc -q expand

How can I expand variables in text strings?

However, I'm quite sure that you are asking the wrong question.

You should instead be asking about Templating systems.

this should do it:
$value =~ s/\$(\w+)/${$1}/g;

 

[Dr.Ruud]

Tad McClellan schreef:

Content-Type: text/plain; charset=iso-8859-1
[...]
Whatâ?Ts wrong

Try LANG="" perldoc ...